Playing Johto with 4th gen mechanics was amazing to me. Didn't care much for the Follow Me feature, because they did it wrong (you can't choose the Pokémon that follows you, just the first one in the party).
As for FRLG, I'm playing through that again and the experience is meh. 3rd gen movepools suck and the game wasn't changed much. It seems Gamefreak was a bit afraid of trying different stuff with FRLG. Also I wouldn't be able to play FRLG on a real cart, because of the fact Giovanni has a Rhyhorn at Viridian Gym instead of a Rhydon. I dare say, the original RBY might be superior!