I proposed to my wife in the rose garden back in 2000. It was through packages that Disney used to offer, not sure if they still do or not.
Great location as in may all the flowers should be blooming (I think) and you have a wonderful view of the castle (and fireworks if at night) yet it is not as crowded as being in front of the castle. Makes it a little more intimate. We had the rose garden completely closed for just the two of us but in all my trips I don't remember ever seeing it ever crowded. Gives you the "aloneness" (if that is a word
) you may want but you're still part of the action.
Good luck
Great location as in may all the flowers should be blooming (I think) and you have a wonderful view of the castle (and fireworks if at night) yet it is not as crowded as being in front of the castle. Makes it a little more intimate. We had the rose garden completely closed for just the two of us but in all my trips I don't remember ever seeing it ever crowded. Gives you the "aloneness" (if that is a word

Good luck