I've only just joined this website and it feels like a second home already.
Everyone above has such interesting takes on it.
Personally, I only use hands if the Top asks for it - if I'm producing a lot of saliva I'll use the flat of my thumb on his balls and gouch in circular motions (like a tongue).
I think a lot of suckers think that using your hands is the right thing to do because they've seen in porn or they feel that the shaft of a big dick is being neglected if they don't. Honestly though, if that's the case, try using your tongue more and varying the pressure of your lips and suction - I tip I find useful is to slide to the tip, tighten my mouth, then slowly lower down - it replicates the sensation of a different hole.