Yep - I find it very handy in vim (and yes, you can click on the tabs in vim too). Clicking and dragging selects things in visual mode, and you can also drag your tabs to reorder them.

Also works in tmux - you can drag your splits to resize them, or select a tmux "tab" to switch to it. You can also select text and then do things with it, like search back in the scrollback for other occurrences, or copy it to the system clipboard. Right click even brings up an in-cli context menu.