Mostly, I love doing all services to all my vehicles. There are a few services that I don't enjoy, such as adjusting valve clearances on the 5-valve Yamaha motocross bike which requires removal of the camshafts (only if the clearances are out of spec). But that's not too terrible, I've become pretty good at it over the years. I also don't enjoy pumping the gear oil out of the Corvette's differential, because it has no drain plug. (What the FFFrench, GM!) But that's once every 6-7 years so it's not too terrible either.
I also enjoy changing my own oil. A few hundred miles before it's due, I will get out all the stuff: filter, new oil jug, drain pan, wrenches, gloves, etc.
On-topic, here are a few (small) things I DON'T enjoy about oil changes:
Waiting for the oil to cool down so it doesn't burn my hands. Usually I'm pretty patient, except when it comes to this specifically. I never change oil when it's cold.
Pulling the old (hot) filter down into the drain pan without splashing, can be annoying depending on the filter placement.
Trying to get a good oil level reading -- new oil can be very hard to see on the dipstick.
These are little gripes, but hey, I have to chime in once in a while