Note Entry - Guitar Pro v. Musescore
I'm sure I'll continue to get better and faster at note entry in Musescore, but have entered at least half a dozen scores -- all songs (some with harmonies and all with accompaniments) -- I've had a fair amount of time to get up the curve, and at this time would like to mention what I find to be the easier-to-use facility for this in Guitar Pro 6.
The central difference is that Guitar Pro permits note values to be entered in a given measure that add up to more than the number of beats available. The second this occurs, the measure and the notes in it turn red and stay that way until you edit it so the note values sum to the correct number of beats. But meanwhile you can freely enter notes, and even copy and paste sequence of notes within the measure to create a similar but improved version (afterwards deleting the original).
This avoids the abundant twiddling of note values and re-entry of clobbered notes that takes place in Musescore. I think it's worth taking a look at for a future version of Musescore.