...Thor throwing a few lightning bolts sans mjolnir and riding the winds like Storm every blue moon. Right now he's just a big idiot with a magical hammer who doesn't have the sense to tap into its powers when he runs across a foe he can't bludgeon to defeat. Him with mjolnir ain't much different than giving a monkey a machine gun lately
I wouldn't want him to fly without Mjolnir. Being pulled along by Mjolnir is an iconic image for the character.
I mean, in theory Thor, Hercules, Juggernaut, etc. should all be capable of leaping miles like the Hulk. But that just feels wrong, you know?