Why I will never use Windows 8/10
devever.net
devever.net
In some cases, I believe that code signing is useful. For example, code signing can prevent non-signed malware from being executed. Granted, it could also be used to keep legitimate developers out or abused by large entities (like stuxnet), but abuse seems rare and mostly nation state oriented.
Also, I'm not aware of a case where a corporation used code signing to keep a legitimate developer/company out of a platform for non-malicious reasons.
Code signing is what is keeping the FBI out of the iPhone. It's how we will keep malicious trojans and other kinds of advanced persistent threats out of the ecosystem in the future.
If you think code signing is a bad idea, then you aren't thinking about the post Snowden security landscape.
Now, what most code signing systems fail on today is the ability to control which keys you trust. Ideally you should be able to manage trust delegation.
But, in the future, we will think of running unsigned code like we currently think of protocols like FTP, telnet and rsh - built for a simpler, more trusting era.
Authenticode seems okay so long as executability doesn't depend on it. But there's a risk Microsoft might interpret it as a vote for "require signing for EXE files" (because the more people use it, the less developers to complain if they require it). If this started to look likely one could always use GPG.
Though in practice this shouldn't be possible... there is a very, very long history of binaries which are no longer updated and never will be, so introducing such a restriction is essentially impossible. (Of course, there's no secure way of determining binary date, so grandfathering is impossible.)
See iOS and flux. GBA4iOS is in a similar boat, but they managed to get around it via a mechanism intended to allow enterprise side loading.
Now I think that my computing experience is better. No more chkdsk on sudden power loss (ZFS is awesome), no more disk defragmentation, no more antivirus/antimalware scanners, no more hunting for updates, no more inordinate number of things starting at boot just because I installed them at some point and no more yearly reinstalls to purge cruft from the system's registry and filesystems. My experience is that my computer performance improves over time with an OSS OS installed, rather than degrading over time like it did with Windows. It is just so much nicer than what I experienced with Windows.
Also, running on an SSD I don't have to do disk defragmentation anymore either.