Many Leafs are having career years too:
Bunting, Matthews, Marner (back half, i.e. 3 months of ugh), Nylander (despite 2.5 months of uhhh), Engvall, Mikheyev, Kampf, Liljegren, Campbell (aside from 2 months of yikes).
Florida has succeeded because they have an effective game plan that they've boiled down to some easy to follow instructions that just needs hard work to execute and let skill show up. They attack very aggressively on the rush across the full width of the ice with active defense (sound familiar?) and they bottle up defensive rush chances by sticking their defense together to steer the play wide before pinching it off (sound familiar?).
The full system sheet (original post) is locked, but this follow up on how to break down their defense, is still available to read. It's from last season, but still relevant.
The Leafs, as evidenced throughout the year, are especially equipped to make Florida look a little more middling than they're used to.