It looks like each line/couplet gives a letter, and those will provide the answer:
When it comes to perspectives, the second is fun
Second person, so you or U
The third is just fine in a romantic tongue
Following from the first line, something to do with the third person in French. Assuming letters again, we get elle (she) or L
Without this, to say you have lots might be trouble
In fact it's so helpful you might order double
You can't say the word 'lots' without the letter 'l', and it appears twice together in many words (though the same is trued of 'o', 't' and 's')
Taking Deusovi's comment into account, it could well be ZZ - without 'z', you can't say zillions
One might rave about this and become enamored
Or think it's the same as a square famous hammer
The letter E - a colloquial term for ecstacy, and equivalent to mc2 - a famous hammer (U can't touch this) squared
I've only had one of the seven in sight
I think the short version's the opposite of right
Opposite of right is either left or wrong - let's assume left, here, and I think we're meant to take the left/first character of whatever 'the seven' is.
Seven Wonders of the World! The Pyramids of Giza are the only one left standing. So, taking P as the first character, then
Mix them together and what have you got?
Something this puzzle most surely is not!
Mix them together suggests scrambling the letters
So we have U, L, ZZ, E and P which in some order give the answer to the puzzle
Puzzle. This title is not the answer, but the title of this stackexchange site is! Not entirely convinced, though. I'm reasonably sure that U, L and E are correct
"One of the seven" might refer to the seven seas, giving us the letter 'c'
If so, we'd have 'u', 'l', 'e' and 'c', plus whatever the double letter is and "the opposite of right". That does assume that all of the lines are letters, though, which I'm less sure of now