Made the jump last week.

The only thing I miss is Android Pay, but it's not a big deal. Cards are fine, you'll just need to remember your wallet.

I did find I had a problem with my work 2FA app, but that's their problem to solve, not mine. Maybe they'll give me a 2FA USB key.

A few pieces of advice:

• Don't forget to back up any apps with local data that support it. You won't get your app data back from the play store. Many FOSS apps have built-in backup optioms to files etc.
• Back up your phone logs and SMS if that's valuable to you, and ideally make sure the backup works on another device.
• Install GCam to keep the same level of camera quality and features as the original app provides. I recommend BigKaKa's versions for good compatibility with Pixels, though they can get a little cluttered.
• Do install both the Play Store and Play Services if you want to use any Google app like YouTube or Maps (even some non-Google ones will need it). Then use a more private app store like Aurora and remove all permissions from the Play Store to strike a good middle-ground.
• The Fossify apps are great alternatives to the imo not very good stock apps preinstalled on LineageOS.