Please NO NO
ReCaptha is very annoying. Hard to decipher images. If the images were easy to decipher they wouldn't need us as chimps to help them. Why should we do work for some company for free? 

It's kind of a double-edge sword where we gain security and a "better user experience". The better user experience being a reduced amount of bots and spam within the site. I do explicitly mention that using a honey pot would be my first preferred method. That in combination with confirmation emails, you can get fairly far with security. However, there are bots smart enough to not fill out hidden elements as well as verify confirmation emails. There are alternatives if you don't want to give Google your data, there is hcaptcha as an alternative.