Steam

I'm the same. I use it to basically bookmark upcoming or early access games so that I can receive updates about them on my news feed.

I don't tend to buy early access games unless it meets very specific criteria: the developer is one person or just a few people, they have been posting frequent substantial updates (patch notes and such count, but if it has a ton of devlogs that are devoid of anything but fluff, I tend to stay clear), and the project speaks to me. Like if it's a type of game I've always wanted to see made, or something.

All that to say, I have accumulated a large wishlist as well. Not as big as OP's, but almost 150 games.