Hello,
what captcha solution are you using on your sites? I personally hate reCaptcha

Yes, reCaptcha is very annoying for the end-user. You can try to use "key captcha":

simple and fast, no text to type, not annoying. But I don't know if it's enough secure or not.

It seems very breakable.

An automated version of this would be possible, but then again - which spammer would develop a software application for that?

Anyone that evaluate access to system as valuable.