I sort of go through that, but not quite to the same extent.
There are weeks that I'm totally enthralled with a certain breed, but then all of a sudden I remember why I have the breeds I do and wonder if I'd genuinely want to try something else. I don't want to fix something that isn't broken, haha. I'm afraid that if I try another breed out that I might not enjoy that breed as much as I enjoy my current breed/s.
Lately I've been on a Rottweiler kick. I grew up with them, loved the ones I had, and now a friend of mine recently got a new Rottweiler puppy. It all started again when my friend told me about her upcoming puppy about a month ago, and I started remembering all the wonderful things about the Rotties I had. Now it really has me thinking that one day I might want another Rottweiler instead of another Doberman... it doesn't really help that Ripley is in a really awful teenage stage either, LOL. But the more I seriously think about it, the more I wonder if a Rottweiler would be better suited to me than a Doberman... or maybe they'd be about on par with one another. I said for a long time I probably wouldn't get another Rottweiler, but more and more I'm thinking that that is less and less true. I can't help but love them and melt every time I see one.
And then there are always the few herding breeds that I've loved for years but am afraid to ever own (Belgian Shepherd, Border Collie, Aussie, Mudi). I fear that they're be too drivey, energetic and intense for me, but I don't know.
I've also been finding myself really drawn to GSDs lately, too. I have no idea why. They aren't a breed I've really been that interested in in the past, but I've been attracted to them lately for some reason.
Kooikerhondje are really striking to me as well, but I think they're probably too soft a dog for me. I've only ever met one, so I'd like to meet more and get to know them a bit. I also adore Dalmatians, but again, have only known a few so would like the chance to meet and get to know more.
Over all though, the more I think about other breeds, the more I find myself comparing them to Tollers (too much). There are just so many traits I love about them and would be disappointed if another breed didn't share many of those traits that are so important to me. I know I'll always have a Toller, and I'd love to always have a Doberman as well, but there are things about Dobermans that I'd like not to have to endure forever (major health issues for one, and they're a ton more work than any other dog I've ever had. They're worth it completely in the end, but there are some really trying moments sometimes).