Yes, I do.
First of all I've bought Pearl just to experience again (and as much as needed) Sinnoh but with different teams. I've bought White, when having AS and Sun just to experience Isshu with native Pokémon and meet the oiginal Team Plasma.
Secondly, I still take a few strolls in HG because that game is awesome and it's the only one where I can truly enjoy my most favorite feature: Pokémon following you, because I'm only two Pokémon away from finishing my National Dex, and also because it's seems like the best a remake can offer in terms of keeping the original while improving and having nice features. I think it has the most friendly menu, the Dex's display is effective and simple and the GS Sounds is a delight!
I've bought my 2DS with Blue pre-installed in order to play Blue and a week ago I've decided to buy VC's Gold but a bit of nostalgia (sprites, colors, music) and to enjoy not having I don't know how many Pokémon to capture.
I've thought of starting a new file in LG but I still didn't had the appeal to do so.
Something that I like in the Sapphire, Gold and LeafGreen is that despite trees being used to fill almost every space (namely in Hoenn) that isn't to be available, it gives a sense of broadness to the world, something that I find lackluster in AS, since it seems, like I've said here a long time ago, the 3DS games seem to suffer/lack more on environment richness and graphics than previous generations (again, Rustboro's buildings are smaller in AS than in Sapphire)
I also plan on keeping playing AS because the secret bases are fun, I have the Dex filled with a lot of Pokémon still to train and experience (despite not having the story to help moving on) and Hoenn is the HQ for my "Leaf Rangers"...it's just too bad that AS doesn't have public/street lightning and Pokémon following you like HG.
PS: here's hoping that the new Go games have the Sevii islands because I really want to revisit an upgraded version of it...if not, I'm going to replay LG.