It's definitely tough to stop when you've been in the park all day and your group is bolting towards the exit to leave. In fact, when I was there last month, my group was heading out of the park and I couldn't stop to answer questions because I had to keep up with them.
However, that said, if they ever catch me when I am by myself or if my friends and I are just leisurely standing/sitting around (both of these scenarios have happened), I will gladly do the surveys. I will do any and all surveys that are asked of me as long as I'm not going to be left behind by my group!

First of all, I do surveys all the time (every single day) anyway, so it's nothing out of the ordinary for me. Second, sometimes the surveys they ask people to do pay off in the end, either with gift cards (some DIS'ers have gotten $50 or $100 Disney gift cards) or in cash ($100 cash). That would be like gold to some people in the parks. You never know which ones may pay off unless you stop and participate. Third, some of the categories are fun - they may ask about the changes at California Adventure, they may ask all about where you've eaten since you've been in the parks, they may ask about the DLR hotels, etc.
When they stop you as you enter the park, all they are usually doing is getting your e-mail address or phone number IF you want to participate in e-mail or phone surveys later on down the road. When they stop you as you exit the park, they are generally ready to do the survey right then and there.
But if I were in your shoes, I can see where I would be annoyed.
