I've found that 5e characters have enough staying power and various means to heal themselves and others that a dedicated healer character is rarely needed, but nice to have on hand. None of my players have played a cleric so far, oddly, but I've had paladins, rangers, artificers and bards. I'm also quite generous when it comes to healing potions, and I've ruled that that sort of stuff is actually something you can buy easily in most cities from an apothecary.