twocats
This is such a great success story to hear! I just continue to be a huge fan of digital scores and large tablets. They're still quite expensive, but I'm glad Apple released a 13" iPad Air, so those looking for size don't have to go the absolute highest end Pro model.
My wireless page turner is actually a spare bluetooth keyboard that I've repurposed, it just sits on the floor comically next to my pedal lyre π To ensure I don't accidentally turn the page backwards, I've adapted a computing UI principle known as Fitts' Law, assign the entire bottom row of the numpad (0 . Enter) to next-page. That way, I can position my foot on the edge of the keyboard, and know that whatever I mash, it'll go in the right direction.
Funny enough, like you I also use yellow and purple highlighter colors, for much the same purpose. Lately, for pieces that have annoyingly frequent key and clef changes, I use the purple highlighter to remind when one of those is coming up.
One bad habit I noticed is being too lazy to make stylus annotations. I'll have trouble on a measure and dismiss the idea of marking it down on the sheets. But after a few days of frustration I'll finally do it, and I always end up realizing how much it helps to have the finger/voicing notes there. I guess I'll never truly learn.
One additional benefit to digital scores - it's so much easier to pull up a piece I'm forgetting, or one I haven't played in years. I don't have to dig through big binders or loose sheets or score books (and if you can't tell, I often find myself too lazy to do that). With the entire library on the tablet, those oldies are just a tap away.
I pretty much use the tablet exclusively, such that I'm completely store away the piano desk and fashioned a frame mount for the tablet. It definitely wouldn't work in a multi-player setup, but alas, it's just me at the keys these days.

If the photo you can actually see the bluetooth keyboard on the floor, as well as a hopefully-inconspicous hump under the carpet where I've stashed the music desk.