I tried to play this game the way I play DnD at first, conserving resources and long resting only after multiple fights. I missed a lot of dialogue in Act 1 and had a hard time in combat.
The combat and camp events are balanced around using long rests frequently. There are a few quests that you can fail by resting (such as the inn burning down or the situation in Grymforge), but generally things are much less urgent than the game makes them sound. Don’t be afraid to dump all your resources into one or two fights and then rest.