I fly with a Captain who regularly disconnects autopilot, autothrottle and flight directors when I am flying without any warning. Ill be flying along then passing usually between FL200 and FL150, I hear the autopilot disconnect and him saying now work out your descent. He also puts a load of crap into the FMC so VNAV is no more use. Back to the 3 times tables with corrections. I also hand flew an entire flight on raw data with him. I really enjoyed it and I learnt so much from him, it's a pity he is part of a very small minority. I usually try and fly a few raw data ILS's per month when possible and only with a few select Captains. I still fly light aircraft so my hand flying skills are not totally gone but I really get bored of all the automatics sometimes.