The other drag is if you make a 32 length pattern, and copy the last notes of a 64 length pattern to it - you have to adjust length to 64 in the new pattern to drag the notes back into it, and reset it to 32 afterwards.
But by and large, if you keep your eye on the bass note and/or calculate that the darker lines on the grid is C above and B below - moving those chunks gets to be pretty easy.