On KDE, there's also Kate. They used to be totally different apps, but these days, KWrite is a simplified version of Kate. They both use the same text editor component, but Kate adds more IDE-like features.
Using X forwarding would require you to install big chunks of GNOME or KDE on the server. A better approach is to mount the remote server over SFTP then use KWrite, gedit, whatever, directly on your desktop.
A similar argument is what finally caused the value of the vi family of editors to click in my brain:
They are designed to be fully functional over even the shittiest possible* remote connection. You can't always count on ctrl, alt, or even the arrow keys being transmitted in a way that is understood by the remote machine.
*Well, I guess the worst possible terminal would be something like an actual teletype, and in that case you'd probably want to fall back to ed or its descendants. To save paper, if nothing else.
In any KDE app you can connect with SFTP in the open file dialog. Just type sftp://user@server/path and you can browse/open/edit files the remote server. ssh keys+agent make things a lot easier here obviously.