I've had the pleasure of training complete newbs, and also having had great sailors volunteer to crew with me.
It gets quickly frustrating when you want to sail, or worse race, and you must explain everything out... Don't get me wrong I enjoy teaching and learning along with newbs when they are slowly understanding and picking up this new skill... but sometimes you don't wanna teach, you JUST want to sail.
Because of this I do enjoy a solo sail. I understand your meaning.
The few times I've had sailors crew with me, with as much or more experience than myself, I've enjoyed it immensely. You even have time to chat, and learn from one another. The boat finds a groove quicker and the tacks become like artwork. The myriad of settings boil down to a handful per station, and they get addressed in a timely manner... the boat sails faster, and more efficiently, and you learn how the boat should feel ALL the time.
I would never give up an opportunity to teach a person to sail, but sometimes you need reminded as to why you enjoy it so much yourself.
I'll add to my own statement. Its a REAL HOOT to teach a complete newb to sail that has NO FEAR of the water, or heeling. Took my nephew out, and he's kind of a thrill seeker... We had 20-25 knot winds, and I threw up a full 135, and main, and we were just POUNDING in the water, heeling like mad (yeah its inefficient, but what of it?).. and just having a grand old time, beating upwind... downwind, we got in the back of the bus, and managed to get the old tub to surf some... pushing double digits in a 4ksb... not a bad day on the water. Needless to say he's been back for more sailing too. Weather was just perfect that day, just some puffy clouds, bright sun, warm air, probably 75ish... and steady winds. Those are the days the extra hands are welcome.