In my experience, people will try to get away with whatever they can get away with. One department here used to take 1hr for lunch while everyone else get's a 1/2hr... why?, because their manager couldn't care less about the rules and decided that his people should get an hour. Now of course everyone get's 1/2hr, but that's just an example of the things that go on in smaller companies.
Really though, so far as I can tell there's a lot less gaming happening during breaks, probably due to YouTube and Facebook. In my first proper job, we would all play Doom, Worms, Descent, ROTT, or Duke3D during lunch. It was great, that's the sad thing - you'd grab something to eat and spend a quality 30 minutes on a level. Doom and Duke3D were best, kill the enemies then kill eachother, great fun. That was good for morale - no matter how crappy your day was going, it always got better at lunchtime.
Nowadays I won't lie... I have an old PC setup in my workshop full of Atari ST roms and STeem, I play it while I wait on things like hard drive formats, OS installs, or sometimes I just hide from Monday in there. If I didn't do something during those boring IT chores, then I'd probably fall asleep.
I am the IT dept, it's all a dark art so people mostly leave me alone in there. I don't know how good it is for other peoples morale, but it alleviates my urges to stab people who keep forgetting their password or pouring cups of coffee over their keyboard. In any case, a happy ME in the workplace is better for everyone in the long run

I am the one who knocks...
