I'm half-way Chapter II (Normal difficulty, lvl 20 now) and I have yet to use Quen, Traps, Bombs or Throwing Knives. They just don't seem worth it (well, besides Quen maybe, but I prevent myself from using it to make the game more fun). Maybe I should go to hard to see your guys battles be "slash, roll, roll, slash" because everyone pretty much dies on groups (especially Harpies. Weakest enemies EVER). Having the attack multiple enemies skill on 100% is great for this, no more worrying about groups, just murder them all at once.
Don't even need to use potions anymore either, like the prologue or act I.
Got 2 skillpoints left as I exited last night to sleep, probably will unlock adrenaline with them. Which probably explains why it feels easy.