There are lemmy instances where downvotes are disabled. It also affects the sorting ‘algorithm’ too IIRC, so browsing on a no-downvote instance vs the opposite can yield quite a different looking feed.

It also allows you to look at content from a different perspective, rather than passing by something that’s been bonked with tons of downvotes.

Active moderation is pretty key though where there isn’t the possibility to downvote, mainly because off topic/spam content can’t be downvoted and won’t disappear from feeds unless deleted by a mod.

Lemmy mods are generally really proactive with removing spam/offtopic stuff IMO, so I’d say to give it a shot if you’re interested. A lot of no-downvote instances aren’t federated with lemmy.world though, and my current one has closed signups so it might be tricky.