#1
Basically, i recently put 10s in my Squier (had 9s before), and the difference in playability wasn't much apart from bends getting a tiny bit more difficult. Then, I did the same thing to my Fender Yngwie Strat.

But the difference was bigger this time. It got considerably more difficult to bend. I still love it, and I'm keeping it, but I want to know why does this happen? Do different guitars react differently to different gauges?
#2
I'm guessing that since Squiers are usually less 'playable' and not as tweaked out, the difference is much more minor. I have my action on one of my guitars set a little high for instance, and putting 11s on it didn't hurt much, since it was already a little stiff. My lower-action guitar (both Les Pauls, different versions but same approximate price and setup) suffers much more from 11s.