I remember under 3.5.10 it was brilliant and had loads of handlers for different protocols, was a fairly decent web browser, had useful plugins for generating thumbnails, web pages, was a great file manager for me.
But with 4 they ditched it and started Dolphin. I stopped using it about this time. Sad.
Also worth mentioning is the fact that, IIRC, Konqueror had equivalent functions to sshFS built in ... I remember specifying fish:// paths in the path-bar and instantly browsing remote SSH filesystems.
This was back in 2004, so I don't believe this was using FUSE...
But with 4 they ditched it and started Dolphin. I stopped using it about this time. Sad.