I am 5'6 and when my kid was sick on a cruise and wanted to sleep in my lower berth, I had to climb into his pullman bed. That was painful. I am not a fit person. And I have to use the bathroom at night 2+ times, so no. Not for me.
So, while the kid loves pullman beds for now (he is 5'5 now, but will soon be 6'+, so we'll see about that), I prefer sofas for the ease of getting into.
ETA:
I am 5'6, <200#, and I just couldn't fit comfortably on one of those lower single berths with my 4 yo. I can't imagine climbing up into a pullman with him and being comfy.