No you're not crazy at all lol! I admit I had my doubts before I got my babies this past spring. I had wanted ducks for years and finally my parents gave in and surprised me with four! But before they brought them home I had pretty much every concern you have. But I can assure I have no regrets whatsoever. I actually didn't know I could become so attached to ducks! They're one of the best things in my life!
As for your family thinking your crazy I say it's their loss. I spend hours a day outside with mine and my whole family thinks it's strange of me, but it's the best part of my day! That definitely seems like enough space for ducks, we don't have much land ourselves, the ducks have their own nice sized pen with a coop inside and they free range for a few hours everyday. They're happy and friendly as could be! I worried our neighbors would be annoyed but it turns out about a month after we moved ours to their outdoor pen they went and got some to hahaha.
I love all mine, but my pekin drake Daryl is my favorite (please don't tell the others!). There's just something so awesome about pekins, so if you do get a pekin I promise she'll steal your heart instantly (and this is coming from someone who absolutely did not want a 'plain white duck' Now he's my baby lol)! I also have a khaki Campbell drake and rouen drake to. I had to rehome my khaki Campbell female today since the boys were gang banging her, but she was the sweetest thing, loved beak massages and sitting on my lap. Great egg layers too, just sayin, if you want three ducks khakis are amazing. (;
And if you're worried about noise drakes are very quiet, mine only quack when they get scared. It's my own personal opinion but I like drakes more than females. They're friendlier and more outgoing and boy are they daredevils lol! It's never a dull moment when I watch them. Not sure all drakes are like this or if mine are just crazy.
Anyways, whichever you decide to do I wish you the best of luck! If you do get some ducks you will be in absolute heaven, every moment you spend with them will feel like you're in paradise. <3 And I can tell by how concerned you are and how much thought you're putting into it that you will be one amazing duck parent. Any duckies would be lucky to have you!