....Hardest is finding time to sit and enjoy it ...
I'm a bit more disciplined about planning my time in the garden.
My favourite job is sitting in the deckchair, in the greenhouse. And I take the time to do that. There will always be a million jobs crying out to be done. But I'm the master in my garden. My garden is not the master of me. 
The worst job, IMO, is clearing out a pond. If a pond contains plants, they eventually need some clearing out. Cutting through matted iris roots a foot deep is hard work; it's dangerous (don't want to cut oneself or the liner); the water is very cold; and it's a filthy job too.