I suppose it's somewhat satisfying to shrink it.
What's incredibly aggravating, however, is making a multi conductor cable up and crimping the last terminal in place, THEN noticing that lone piece of shrink tubing that you forgot to install on one of them sitting forlornly on the bench staring back up at you.
It is inevitably, of course, juuuuuuust a bit too small to slip over the already installed termination.
Been there, done that, all too many times. And if you triple check, somehow a piece will fall off or jump through a wormhole in the short time that passes between you verifying it's there and affixing the terminal.
-Pat
You can actually stretch unshrunk tubing to make it a bit bigger if you need to slip it over something that's just a tad too big. What I do is slip the tubing over a pair of needle nose pliers (as far as it will go) then pry the pliers open, slip the tubing down further, open them so more, rinse repeat. For the really tiny variety, you can start the stretch with a pair of tweezers, then move on to the needle nose.
Using this method, you can stretch a piece of tubing about 5x it's original size! (Though I normally wouldn't go over 3x.) They then shrink right back down to the correct size once you apply heat.
This method is great for upsizing in a pinch when you're out of the correct size, or when you need to get the tubing over something but don't want to use a larger size.