The Danganronpas, metal gear solid HD collection, wipeout, madden, fifa, odin sphere, Assassin's Creed, super stardust, the final fantasy games that like X, X-2, and World of Final Fantasy, Tales of Hearts, and Trails of Cold Steel I & II. Every once in a while I would dabble in persona. Even minecraft. I already had an entire compound built up on my vita, but I wasn't about to start from scratch, yet again on my Switch. I ended up with like 30-40 hard copies of Vita games after years of picking up random games, mostly for cheap.
And that's not to say they were all good. I couldn't get into Gravity Rush at all, nor did I like Borderlands 2 or Black Ops: Declassified, and Freedom Wars got old very quickly. I have hard copies of all of them, but I don't think I'll ever crack open those cases again. I even got one of those japanese girl fighting games to try (Sengan Kagura I think). The icon was a girl's ass in panties. Super cringe.
To be honest, I think a big part of that was Playstation Plus. Every month I had two games to at least try for no additional cost, so there was always something new to try. Even if I only spent like an hour playign it before I got bored of it, it was still new. But every once in a while there was something like Helldivers or Sine More that I didn't put down for weeks. Besides that I got games like Uncharted, Gravity Rush, Wipeout, Need for Speed, Sly Cooper, and so many more top tier Vita titles for no upfront cost, ready to download whenever I like. Then there was all of the PS1 classics I played my formative gaming years playing that I got mostly when I played PSP and PS3, and even PSP digital games were solid on Vita. To this day there's no portable hockey experience better than NHL 07 for PSP on Vita.
And maybe that's one of my biggest problems. So many of those great indie/third party games that are out/coming to the Switch I've already played and owned on my Vita or PS3 or PS4. I don't feel any need to go back and start many of these games again, and if I did, I certainly don't feel like paying money for a game I already got for "free" on PS+. I'd just break out the Vita instead.