Well, on that "grass is greener" thing, I've never heard this applied to divorce. It's usually used when a person thinks they'd be happier with a different partner. If that's the case, you should have mentioned it, because it's a game changer when you have kids. If this isn't the case, then it's very different.
What you want to remember is that when your kids get older, you want to be able to tell them you did everything you could to make it work. You didn't say anything specific about your husband, but if you're truly unhappy and he doesn't seem to care, have you mentioned couples counseling? The biggest cause of unhappy marriages is bad communication, and it's amazing what a good talk therapist can do to get you guys back on the same page. You say the 2 of you have talked a lot, but that doesn't guarantee good communication.
So you're kind of asking the wrong question. Of course some people are happier after divorce. Others aren't, and by the time the realize it, it's too late.
With kids involved, the stakes are much higher, so just take time to think this through carefully. And if there's another man you're crushing on or whatever, you've got to remove that from the equation. It's not fair to anybody, including you.