It was interesting cycling up Redstone Rigg on the Tour of East Lothian (35+mph headwind up c.20% rising through 400m+) through driving sleet and snow that the people like myself with a really low gear were able to keep a higher cadence and hence even out the power going through the wheel to keep traction.
Chainline is a good reason to get a triple as that extra 5-15w saved by a nicely aligned chain can get you down the road further, and personally unless I'm on Di2 the number of clicks needed to keep a steady cadence on my compact setup gets a little annoying. Although obviously everyone has different priorities on what fatigues you.
I'm going to be dropping some serious money on a new wonder bike soon… and I'll probably be getting a triple geared 26x40x50, with odd numbered cogs at the back.
One of the great conveniences with my existing 28x41x52 triple onto a 12x32 8sp cassette is that when I'm comfortably making progress on the middle ring I can change up by either changing to the big ring (with no additional rear mech change) from the 21T or the 19T. Then once speed has built up simply change on the rear mech. However, I have down-tube shifters on that bike, where brifters make short work of this, it isn't so much of an issue.