The toilet stool (Squatty Potty is probably the most well known brand name) is game changing. Highly recommend. That may be some of the lowest cost to benefit thing I've found for the home.
The only downside is that you'll miss it whenever nature calls outside the home.
I actually prefer single-ply. I bunch it up (I'm not a folder) and it's far superior to that fluffy stuff that your fingers go right through and then sticks to your bum. Scott 1000-sheet + bidet + squatty potty is perfection to me.
The only downside is that you'll miss it whenever nature calls outside the home.