Oh I didn't think people (guys) actually thought that worked with women. I've also heard about this about guys who got rejected or frustrated.
Girls confess to guys too. It's just a facet of Japanese culture.
Like I said, timing of the confession remains the most important thing. If the girl/guy likes you already and wants to go steady, the confession is just to formalise the dating aspect.
Using it as a declaration of love and setting boundaries at the same time is highly unlikely to succeed, regardless of your gender.
It's just like telling your crush you like them when he/she hasn't gotten to know you yet - which is not unique to Japan - and expecting them to somehow go, "Yeah, I like you too!" Unless they already had those feelings (and sometimes people do, which is the whole idea behind that), she's not going to suddenly realise how desirable you are.
Imho people who do that don't really have many ideas about how to approach a relationship, hence the "ripping off the band-aid" approach.
However, sometimes it helps if the person you like is clueless about your feelings. There was a girl who liked me in high school and I never realised it until she told me after. She was always nice to me and asked me out on a few dates, but I didn't think of it that way. If she had confessed, I might have been willing to give it a chance.
Regardless, I don't recommend confessing to someone to show that you like them.