I do realize that there were a lot of bugfixes after the 7.5 release. However, I'd like to point out that most of the bugfixes in these minor releases actually targeted old bugs that existed before the 7.5 launch. In other words, the majority of the bugs fixed in 7.5.1 - 7.5.7 were not caused by changes committed in 7.5.
Yes, sometimes bugfixes are launched one after the other. I typically launch a bugfix as soon as the bug as fixed, so that everyone can get the updated version as soon as possible. Sometimes this even means more than one bugfix release in a day, if a new bug is reported or uncovered after the previous bugfix release.
I do understand that this system of launching bugfixes as soon as they're ready makes it a pain for those like yourself who install every single patch via FTP. If automatic upgrading isn't an option on your site, then I would recommend simply refraining from installing every single patch. Most of the bugfixes in the last seven minor releases, for example, fixed bugs that were fairly trivial, and chances are you didn't even notice most of them. If you're not affected by a bug, you don't have to install the fix as soon as it comes out. Perhaps you could choose to check for updates to SEO Ultimate just once every couple of weeks (unless of course there's a bug that's affecting you specifically, in which case you can install the fix out of cycle).