If you're looking for games with almost no Japanese text, you're not going to find many. There's basically:

Battle Heat, Tengai Makyo, and Queen of Queens (FMV fighting games and kind of tricky to figure out)
Chip-chan Kick (Bubble Bobble-style game; its lolicon angle is kind of creepy, but it's not actually pornographic in any way)
Zeroigar (vertical shmup)
Zenki (beat 'em up)

There's also a baseball game (but I don't know how much text you have to wade through), and some various mahjong, card, pachinko, etc. type games that you may be able to play.

But, honestly, many of the games are playable if have a little patience for some trial and error. If you're already a player of strategy RPGs, you should know their conventions and that they tend to be pretty straightforward. You could play through Farland Story, Der Langrisser, Power Dolls, etc. Same goes for many of the traditional RPGs (although some of them are kind of obtuse, like Blue Breaker). If you like side-scrolling adventure games, you should check out Last Imperial Prince and Ruruli Ra Rura.

Check GameFAQs for FAQs. There are some games that have.

Oh, and the whole "loads of hentai games" thing is just a stereotype that the system has. It's actually not true. The PC-FX has a library of about 60 games, and only about 10 are hentai. Not that those aren't worth playing. Pia Carrot is a very good dating sim/visual novel. Check out the fan translation. You can burn a disc with the translation and play it right on your PC-FX.