They're adding a HP restore on every smite to replace red buff smite.
Blue smite is rarely useful; the only junglers that need it are ones that Riot doesn't really want jungling anyway.
Gromp is useless, even during first clear. It contributes almost no damage.
Wolf isn't really useful compared to raptors.
Raptors were the only ones worth smiting past first clear unless you're just smiting for speed.
Krugs were useful for clearing, but it enabled way too many junglers that shouldn't be jungling in the first place.
So in actuality, the only thing they're removing is something that's holding red/blue champion smite back, and champions who shouldn't be jungling in the first place.
Its a fantastic change, even if they weren't adding plants.
Literally the only thing that would be missed is raptor smite, as far as game health. Vision itself is fucked lately, and Riot needs to work on it though.