I've never played D&D and I'm getting into BG3. I must be marathoning my characters cause I'm usually out of spells when I run into fights. My useful exploration spells also cost spell slots so I'm usually proceeding with cantrips for my adventures until I decide I really need to recharge.
How often is everyone else going through a long rest? I know there's a trade off of consuming camp supplies and so maybe I'm just the guy who saves all the items for end game and never ends up using them.
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.