I really miss healing. In Origins my mages had constantly to decide whether to use their time/mana for crowd control, damage, or a heal. In DAI barrier use is much spammier than healing ever was (in my games)--and to me, much less satisfying. This is partly because I enjoy playing a healer and partly because I prefer higher risk, bigger payoff gameplay, in TES terms always an altmer, never a Breton. Forcing risk avoidance as the basis of combat makes it ... dull.
Of course, I may be unique in my attitude towards potions. Using one always feels like failure, and I've had to use maybe 5 in about 20 hours of DAI. For some reason using scarce character resources to cast a heal feels like a choice to me, where gulping a potion feels cheap. Getting to sell off unneeded potions also feels like a nice reward for careful play. 
Playing on normal the new approach didn't (so far as I got before I abandoned the game possibly to be played post-patch) feel harder or more strategic, just less fun. Sorry the OP ran into a situation more frustrating than any I experienced. As far as I got potions were too easy to come by for running out to feel like a real danger.