I speak intermediate Spanish. I'll try my hand at describing it...
--there's something I associate with immediacy---it SEEMS that Spanish speakers are speaking quickly, though I think this is not always the case. It has the strange quality of being both smooth and a bit choppy at the same time. I like to compare it to being on a boat in a river---there aren't any rapids or whitewater, but you're still flowing along at a steady pace. I always think of dancing when I hear Spanish--like my feet want to move.
Or maybe it's just because of the Gypsy Kings:
I'm also trying to learn French---and I confess the pronunciation has thrown me off quite a bit.
I think French is very elegantly smooth. I honestly think I could be cussed out in French and still think it is a beautiful language. Whereas Spanish makes me want to dance, French has a sound that makes me want to curl up on the couch with a good book and cup of coffee. If Spanish is a river, then French is a smooth, silky lake. I confess that I didn't really hear a lot of the nasal "n" when I first heard French---and the way they blend words together sounds incredibly poetic, though hard to understand....
If French is poetry, Spanish is rap.
And in case you didn't hear it enough in "Inception"--here is "Non, je ne regrette rein"