Yep, gotta love kioslaves and kparts. I was really impressed (and confused) when once my konqueror morphed into korganizer.Love kde's philosophy that programs use one codebase, modules and concepts and using as daily driver on work and at home.
Although kioslaves have a big drawback : they're not usable outside the KDE environment (try opening an sftp/fish file from dolphin in vlc). AFAIK (haven't tried) GVFS enables that, as does fuse. But it's being worked on for Frameworks 5!