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My latest play of Omega Ruby I used this team.
I didn't use the exp share, and I also never fought wild pokemon. I also didn't explore most of the water routes before beating the league. I also didn't use any healing items, either in battle or out. I also did every gym and dungeon in one run without returning to a pokemon center to heal.
I was regularly 10+ levels behind whoever I was battling, against Steven it might have been 15-20.
It was never hard. Certain battles were a little tricky, but never really difficult. I don't think I ever lost a battle.
Pokemon is not a hard series. Turning off the exp share does not force you to grind. You can turn it off instantly and never have to use it. It's a complete non-issue unless you do want to grind a lot, at which point it's an incredible boon.