This is kinda how I treated it, but I was also paranoid of the story moving forward while I rested which was based off of a rumor I thought I heard about the Emerald Grove kicking out the Tieflings in Act 1 if you took too long or something, but I'm not sure if that's true. I got. A lot more liberal with my use of long rests halfway through Act 2 but I don't abuse it and basically try to save it for when I'm low on spellslots and such. The camp supplies are so easy to come by that I actually haven't even had to use the Supplies inventory item and just throw food in every time.Kind of my complaint too. You could pop out and long rest, come in blasting fireballs in every tough fight, but it doesn't seem fair. Basically every long rest I did the whole game, the whole party was pretty much totally spent. I don't really like that the only calibration on the appropriate amount of long rests is just your own intuition about what feels right. I think in BG1 you would get ambushed during long rests seemingly whenever you really needed a peaceful one.
The posts above are convincing me to take more rests in a row and see what I'm missing out on.