Quotes existed originally as a way to match phrases, more than one word. + was meant for matching a single word. Quotes replaced the way to match a single word, while still remaining the way to phrase search.
> lyrics "walk down the aisle at the store"
it'll do an inexact phrase search, and if I do:
> lyrics walk down the "aisle" at the "store"
it'll do a normal search but with exact-match for aisle and store.
But in this example, that doesn't appear to be the case - looks like the first example is exact match phrase search?