SB,
Although it hasn't been the case for me the last few years, and I can't say I've waited 4 hours, but I "have" waited a two hours (and more) before, due to long lines. And yes, I do wait because I take voting very seriously, as should everyone. Whether or not these waits are few and far between, I don't know. I would have bitched a long long time ago, if the two hour wait was every single year.
Btw, it's my understanding that your employer "must" give you time to vote, should you decide to do it during the work day.
TIS