I’ve only had to share a room when it was one night, two beds, and last minute (no other rooms available). And that’s only happened once. Also if the mattress isn’t right I’ll snore so it’s not hard to get people to not want to be roomies.
In the good ol’ days (the mid 80’s) my dad’s company would pay for my family to fly business class to go visit back in the US (from Sweden). I flew coach to Tel Aviv via Istanbul on Turkish air and it was really nice. Not that coach is really nice, but Turkish Air get’s the job done.