I have to say that to me counting helps me with my intensity. I get really antsy when I'm looking at a clock and seeing how close to the end of a set I am. That's more of a problem than counting. The count actually gives me a cadence per stroke, and each one is exactly the same as the last. This to me is the best method for jelqing because it is very monotonous and this actually can break it up quite a bit, because it gives you a pace and then you only have to reach the end of the set. Focus would be much more intense with the focus on reps as opposed to time. If you're doing more than 200-400 jelqs at a time you may want to reevaluate your routine a bit.