I too find Patterson reels fairly easy to load with 120 (and 220). They need to be absolutely dry and you need to pull the film through the guides and little ball barings, rather than push it. Someone said they have more trouble loading 35mm. I tend to leave the leader out and put that onto the reel in the light, then do the rest in the dark. Obviously you can't do that with medium format, but it's no major problem.

David.