It's true tho, not only for weird line patterns and stuff
doing fullscreen 1/2 jumps on 200bpm or higher on CS5 with tablet is hard as hell because of hovering, you end up missing between the jumps. you need to practice being super steady with the hand that holds the pen
meanwhile with mouse it's easy to land exactly on the the circles as long as you moved in the right direction and you have enough speed. stuff like those diamonds on atama is a nightmare with tablet and with mouse it's like a free +combo
http://osu.ppy.sh/b/150406&m=0the first few seconds on this map
with mouse it's really easy
with tablet it's like buuuuuutttfuuuuuck