Perhaps not for levels 1-3, but after that levels just fly by.
Especially in Act III where I feel like I'm showered by big XP rewards from easy enemies, and by just walking into places. It's like they wanted to make sure you hit level 12 by the end of the game no matter what quests you skip. So now I've been level 12 for a while and more and more XP is just pouring in.
Level advancement should be significantly slower. You should get a feel of every level, so that leveling up feels like a real reward. This feels like the devs are scared that players will get bored if they don't level up constantly. Trust the content. Trust how good it feels to level up when it's harder.
If anything, you will get bored if you reach level 12 but still have tons of quests to do. Hitting the level cap is not fun. I wish my party was still level 10 because I clearly have lots of things left to do.
