I had the exact same reaction when I looked up phalloplasty and even metoidioplasty for the first time, knives, down there, just no. I'm not a big fan of any surgeries, I don't trust what people might do while I'm completely knocked out, and I don't think I could ever trust someone to go messing around down there with no knowledge or ability to have input (I really freaked out my hospital when I was 13 because they couldn't handle the fact that I would be mature enough to have a very minor 9 minute operation on my hand with local anaesthetic and the message didn't reach everyone until half an hour before that I wasn't having a general.) The results aren't good enough for me to go through that at the moment, but I might change my opinion later.
I don't hate my parts that much, I just tend to try and forget that they're there. I can stomach sex with them and everything, but I still wish they were male though. Part of me is wishing that T didn't change them because I feel that I'd rather have parts that were "one or the other", but the part of me that's leaning towards desperately wanting something down there is growing. It's just something that I'll have to see about later personally, but it's not weird to not want bottom surgery, or feel deep hatred of those parts. Almost everyone I've heard talk about it feels stronger about top surgery and T than down there, because as you say, no one knows what's there except you and any partners. It's like why I can't understand women who spend a fortune on underwear, no one sees it! (I know guys do, but at least people can see the waistband of boxers sometimes.)
And there's nothing weird about wanting to not be out and proud about being trans either. Plenty of guys are stealth, and I personally will be when I get things moving. It probably seems like you know more people who are out about it because the rest of us just meld in with all the cisguys and you'd not know they were there. Sites like this show that there are plenty more trans guys out there than people realise.