I was only disappointed to see it go because of the Add-On hosting honestly.
Almost everybody used it, it was full of simple and organized categories. It made it so much easier to find Add-Ons having them all in one place.
I mean yeah, there's Blockland Glass, but not everyone uses its add-on hosting, and there are very few categories. Most people post their stuff on the forums anyways, but there's no tag system in place to make finding Add-Ons easier, and the "Sort by" function is completely broken.
As far as I know, the only real way to find Add-Ons is checking out servers that might have some and hoping the host will let you know what it's called and where to get it, general word of mouth, or constantly checking the Add-Ons board and seeing something good at the right time.
I'm amazed that after these couple of years Blockland has been on Steam there still is no workshop support.