I agree completely. In fact, I have found over the years, I generally get more benefit from cycling (hills in particular) than I do from trail running. Nothing empirical, it just seems to work better for me.
As far as getting thrashed is concerned; race cyclocross. Training for and racing 'cross is the best of both worlds in terms of anaerobic and aerobic training. Oddly, I seem to be in the best shape of the year around the first of December. Many, many scrapes, bruises, sprained body parts and broken/bent components, but a good workout nonetheless.