Well, I think part of the reason people read fiction is to get away from their current lives, either by going back in time, forward in time, to another world, into a situation they wouldn't personally know how to handle, etc.
It's up to us as writers to make the readers believe in what we've created, whether it's based on reality or not.
Everyone gets distracted. Some of us use different techniques -- I have to have music (rock of all kinds, with lyrics) going or I'm really stymied. The right music and the book flows. Others need silence and solitude. As I write this (on my laptop while I wait for my PC to reboot) I'm listening to the movie my husband's watching pretty much right next to me. For me, that's ideal. For someone else, they couldn't write.
Most distractions are like that -- affect some and not others. But if you're wondering if anyone would want to come home -- after a 3 hour bumper to bumper commute, which came after sitting at a desk all day doing something they probably didn't "dream" of as a kid, after an overpriced and not so hot lunch, after a day that started to early, after a 3 hour commute in -- and escape into the Old West, the future, another world, an exotic romance, or a race to save mankind, my answer is: Of course.
If you're wondering how to get it all back after something's taken you out of the zone, to me, that's one of the things I rely on AW for. So many places to go -- to find information, share knowledge, play games, have fun, argue a point vehemently, do some research, hang with like-minded folks who really do understand what it's like. I hang out here when I need a break, a quick respite, or to do something that gets the creative stuff flowing.
Hang in -- we all have cruddy days. Tomorrow'll be better!