I'm referring specifically to this sort of structure, where the notes cascade upwards or downwards but most often up and then back down. Many of the pieces I play (on piano) involve this rather heavily, and it's always a serious dilemma for me.
I have to sit down and carefully figure out the fingering, then play them very slowly over and over and over again until my hand can gloss through them in a fluid and clear motion, but this takes me literally 300-400 repetitions. Meanwhile I know many other players who can just sight read these things, not quickly on the first try, but it seems they just know the fingering by instinct and then they just go through it a few times and there you have it.
I don't know if this matters or not, but the stuff I have trouble with isn't as simple as seen in the example above...not just scales or something like that. I'm talking more about (for instance) Chopin's Op.10 No.12, which took me 9 months of slow repetition when I learned it a few years ago, and I'm no better now in that respect than I was then. It's infuriating.