I wholeheartedly agree! At the time of the Adobe password leak, I was surprised to find that I had an account there. I'm not a heavy Adobe user, and certainly not a paying customer. So why did I have an account? I suspect I had to create one at some point simply to be able to download something for free. Requiring registration for something that's free is totally unnecessary. Now they had my password for something that didn't need one, and by leaking it, they leaked the password I also used on other sites that shouldn't need a password.

There's a popular Dutch site, datumprikker.nl (date picker) that works exactly like the author describes. No need for accounts; just a link and you fill in only the stuff that's actually necessary for the service to work. It's very popular for a reason: no hassle, easy to use, nobody has to register or sign up.