I'll admit I was using 56k dial-up before I got the fios and it was totally fine for most of the things I do, namely cboard and browsing documentation*.
"Fine" however means I didn't have to wait very long, vs. not having to wait at all (it's instantaneous), so it's kind kind of like the processor: once you get used to a faster one, going back to a slower one (which seemed "totally fine" before) is irritating. So if you're okay with it and don't want to get addicted to something more expensive, stick with the dial-up.
* I also download/upload mb sized files fairly often, that is almost unworkable at 56k.