I just reached 112 myself.
I’m very much awaiting a time when users can block specific instances. I still don’t want to check the option to hide NSFW content, because I do want to see NSFW content that may show up on non-porn communities. Just not really interested in seeing so much porn in All.
You can check on your settings page, btw, in the Blocks tab - count quickly with Ctrl+F.
Until somebody on the instance subscribes to a community it doesn’t get federated to an instance. Browsing by all is in effect saying let the others on my same host do the work of finding my communities and then trying to cull out the parts you don’t like.
I do understand that’s how it works, but considering I’m on the largest instance I’m not really sure that matters for me. Definitely worth keeping in mind for people on smaller instances though, or people interested in very small communities.
For what it’s worth, I am subscribed to 55 communities, from back when I was giving the Subscribed page a shot.
An option to search only communities that aren’t yet federated to your instance may be an interesting feature to add in the future.