Restoration in Morrowind is genuinely different from Skyrim, but not in the way you're hoping - it's actually less useful overall, which is the real problem. There are no perks that make healing spells suddenly click. The tedium you're feeling isn't a skill issue; it's just how the system works.
That said, don't dump it entirely. The thing Morrowind does better than Skyrim is letting you mix schools. A pure mage run doesn't have to mean you're locked into one playstyle. Restoration gets you access to some solid utility spells - cure disease, cure poison, that kind of thing - which actually matter way more in Morrowind than Skyrim because those status effects are way more punishing. There's also levitation and water-walking spells that live in Restoration, and those are genuinely useful for exploring.
But yeah, for healing specifically? Potions are the move. Alchemy is broken in Morrowind (in a good way), and you can make healing potions that are dirt cheap and way faster than casting. If you're determined to heal with magic, Alteration has the spellshield spells which work better defensively anyway.
My suggestion: level Restoration to whatever threshold unlocks the utility stuff you want, then let it coast. Spend your real effort on Destruction for offense and Alteration for defense + mobility. That's where Morrowind magic actually shines compared to Skyrim's more straightforward spell system.