You do not gain levels by conjuring. You gain levels by conjuring in combat.

Or casting Soul Trap on a dead body (just saying...)
@OP: I voted no but I still think that maybe a few of these things shouldn't be in the game or be modified. I finally got smithing to 100 (I'm level 64) by only making the best stuff for my level and not buying materials (yes I went from 90 to 100 making/upgrading Daedric daggers with ebony I mined/found, reading books and doing quests). I would have really liked to use and sell all the leather and iron I have stockpiled but I couldn't without maxing smithing. Similar story with Enchanting except it's not maxed yet because I don't have enough greater/grand soul gems so I can't use my petty, lesser, and common to make some money without power-leveling enchanting off dirt cheap enchants.
Obviously I've chosen to take control of the situation to keep the game fun for me but I wish I didn't have to
actively try and keep it fun and challenging. Games are better when you don't have to think, plan, follow self-imposed rules, and generally force the game to remain fun. Some of the exploits are just so easy it's actually hard to avoid them.
Regarding spells, use Muffle in the way it's intended. I cast and maintain Muffle along with my best armor spell when I'm in the wilderness or a dungeon. Illusion shoots up really, really fast. Or use Detect Life/Death frequently, as intended for checking what's around you/a corner and coming up ahead, or to find that growling bear, and Alteration shoots up.