there are lots of uses for old hoses, but suddenly I can only think of a couple...

rope cover for anything heavy you want to hang from a tree (tree swing, tire swing), also works if you have a new tree with wire supports.

I have used them in odd ways also, to prevent a clip on flag hanger slipping down the metal flag pole, there is just enough grip to keep it stable.

we are crazy about reusing stuff ;-) You just have to temper the keeping of old stuff with the purging of old stuff or soon you can't park in the garage.

I found this url below:
Now, I do use short pieces of old garden hose to make it easier to carry those 5-gallon buckets. Many such buckets have those plastic pieces that disintegrate after a while, so a piece of hose to slip on really comes in handy.

Here is a link that might be useful: New uses, old garden hose

I didn't look at the link, but I save old hose to wrap rope used to tie down new trees.

I had a vine that was growing in the wrong spots on an arbor. I used an old hose to pull clumps of the vine into the empty spaces.