I'm 6'1" with fairly long arms and have been playing with a 59" cue for a while. I wanted some more extra length so I had Paul Sumrall build me a cue with a 31" butt and ~30" shaft with the wrap a little further back then normal. It's balanced very well, and the shaft taper is stiff enough that there is no "whippiness" whatsoever. Plus, with the wrap further back my hand is always on it instead of the butt sleeve. I'm all for the longer cues, and in my experience they're not unwieldy or cumbersome as long as you have a good cuemaker who knows how to deal with the extra length.
Pics of my new Cue
Pics of my new Cue