So, other than wanting float up to places that have no reason or purpose to go to for the game, as in no loot, no NPCs, no marked or unmarked quests, no Easter Eggs, the spell is not needed.
Ahh, see there is where we disagree. It is an open world my friend and there is a lot more to do than just quests. There is admiring the view to consider. As I mentioned earlier, the view from the highest rooftops in the city is fantastic. It should be on everyone's list of 1001 Things To Do in TES Before Your Character Dies.
There are also the combat advantages of high perches.
And there may be some Easter Eggs/loot. I found some interesting stuff/loot on rooftops in Crucible (ale, food and a magical ring). Cannot remember if those particular rooftops were accessible by ordinary means or not, but they were pretty high and seemed rather inaccessible at the time. Apparantly that is part of an unmarked quest called the "paranoid roof watcher." The UESP says you need a high acrobatics skill to get up on these roofs, but it does not say how high, so I don't know if that particular jump qualifies as a super jump or not.
Regardless, as to your point that the "spell is not needed," I never said it was "needed," just that it was wanted. You don't "need" a lockpicking spell in Skyrim because you have lockpicks. That does not stop folks from wanting them because forcing a mage to use a lockpick is poor form.
For that matter, you don't "need" two handed weapons because one handed weapons work just fine. I challenge you sir to point out a single quest where you "need" two-handed weapons to complete the quest. You cannot, so your argument that levitation is not needed applies with equal weight to two-handed weapons. They are not needed and serve no purpose that is not equally served by one handed weapons.
Just like having both two-handed weapons and one-handed weapons in the same game could be argued to be redundant and not "needed" for any purpose of the game, things like levitation and open lock spells are not "needed" to complete quests but they are wanted to add more flavor and variety to the game.