It's very true that rangefinders (not just Leica) aren't for everybody. They take a lot of work, and good/quick hand/eye reflexes. The point being made is that it's not the camera's fault. They take years of practice - my first rf was an Olympus XA back in 1982 or so. And I've shot Leicas, Mamiyas, Fuji's etc since then, along with slrs.
The story I like to tell people considering an M is when an old girlfriend bought her father an M6. He'd fawned all over mine, and she said he'd always talked about owning one. Well, she presented it to him on a family vacation we were on in Italy. I watched in sadness as he slung it over his neck and then proceeded to take pics the rest of the time with his taped up Minolta p&s. He maybe shot two frames with the Leica. I'm pretty sure it went onto a bookshelf and there it lived. No matter how much I tried to help him it was just too much camera for him. I think we should have bought him a Contax T2 or Leica minilux.
So don't feel bad and just use what works for you. I recommend people buy a used M6 and Voigt lens and see if they even like the rf way of working before plopping down $10k on an M9 and lens.