Reverse the blade tool (merge clips together)
If that's a cut within the same clip, you can move the right edge of the first clip to the end of the second clip, to restore the formerly length. 
If you want to combine different clips to make some pivotal changes or append centrical effects. You have to create a compound clip.
If it was a cut within one clip, you can simply undo it. But i hope you know that.


I dont' know what you mean with "I'm-done-here-move-on-feeling", but a typical project has hundreds and thousands cuts. That's absolutely normal.