Those that can walk and chew bubble gum at the same time may not need to pause while having that moment of intention!(grin) More seriously, a player should have crossed the line of demarcation while standing. If I pause, which I do occasionally, It is for a gathering of focus, either on the stroke or exactly where the balls are going.
I tend to do the same. But I do this on every shot. I am not thinking about anything other than where I hit the cueball. It's more like 'steadying the ship' so that the intended cue action can take place most reliably.
You seem like you may have thinking going on in the down position even if only for a moment, a bad thing. An important key to my play is that each inning should be one continuous action. Granted if there is an error I have to straighten up and regroup. However, if an inning is going smoothly, one ball or ten, there isn't any thought process once I lean over to hit the first ball.
Indecision, or understanding and adapting the process of play, is something that I have had to work on a lot coming from snooker. I did indeed often have more than one option in my head, or indecision at times. But that is what Pre-shot routine is for. Having the opportunity to play with great players, has been a great learning process, and something I have enjoyed most about playing.
Adapting the cue action from snooker was a challenge for me to begin with. I have the same pause in my action, for the same purpose. But other aspects needed alteration. The pause is not for thinking, that is what we do when we are standing and observing the table. When you are down on the shot, you have committed to the desired shot, and have imagined your perfect outcome. The pause, is more like I mentioned, 'steadying the ship' ready to deliver the cue reliably.
Anyone thinking in the down position needs to start by setting up a simple three ball run.
I mean, I tend to always play the table as it lies on approach, I visualize perfect sure, but not everything goes to plan all the time. Thinking 9/10 balls into the future can be done, but accepting that perfectly aligning 9/10 shots is not a given, and that being fixed to one plan can actually create more indecision, or frustration, should be acknowledged.
In my experience trying to solve those issues that naturally arise, or the outcomes that are not expected, needs to be done in each and every shot "did I land where I imagined? how far from that point? how must I adjust my next shot to continue with the plan?" Thinking 2 or 3 balls in advance is far more productive. The outcome isn't always going to be as expected, and fluidity is needed to alter and adjust the plan. Naturally, problem balls need to be considered from ball 1, but there should always be 'options' available for when things go awry.
Decision making is always done when approaching the table, PSR prepares you for the shot at hand that you have selected based on your observation, the shot can then take place. That's how I've worked my game presently at least. I have far more success in running the table that way.
How much do we think about driving a vehicle? We might drive thirty minutes or an hour without thinking about driving.
I don't know, it depends on several things. You'd crash pretty quickly where I'm from

But then we do not have motorways/highways. We have many old twisting and turning roads. You'd be a fool to do that on the enormous, multi-lane roads, filled with cars, where I currently find myself living. But I can see your point from my experiences driving long roads, long miles and long hours, during my time in the US.
No reason we can't run balls for two to five minutes without thinking about it.
I mean, there are definitely those times where less thought is required, but that is depending on many variables. In game pressures, and the psychology involved in playing a top player being just one example - this will have you second guessing yourself far more than when you are showing off to a girl you brought on a date