GSF's maps were my favorite maps. I loved terrain and I drive around in my FROG Tank Battlefield whenever i'd get bored. I'd play ZAPT in the Kitchen fridge, Pecon7's boss battles in the Bedroom. HITNOKAT, Random Players and I would race Pandan's Raceway map with side-car motorbikes.
At first when shaders came out, I could run them on low and still be satisfied with the Shaders. After a revision or two, my GC wasn't compatible with Shaders anymore, so there was really no reason to play anymore. The servers sucked, no maps, HK, and a few other friends left the game. The servers are fine nowadays, but I still miss terrain for nostalgic reasons, and for the fact they made this game Blockland.
You were a lego figure, in a Bedroom, building all sorts of creations and battling each other for no reason. Flying planes in the Kitchen, CTF in the backyard, and finding the Golden Brick in Construct. Sure, the some maps may have been low quality, but most of them were well executed. Shaders and Terrain are compatible to an extent, but Terrain is/was holding back the progress, plus the Devs didn't care for it. In the future, there may be a way to fix this, but until then Terrain generators are your friends.
Another player-made copy of v20 would be cool.