Honestly I forget it's even there. For the most part, only mobile games ported to the Switch use it.

And many first party games, of course. It's not a great experience, though - on the OG switch, at least, the screen is really low quality.

I feel like a lot of games optimize their UI for TVs, but at that size scaled down the touch targets would be too small to not fat-finger.

Switch games can actually target handheld mode vs. tv mode and give you a better experience to solve that problem. Few of them do, unfortunately, IME.