I think it's worth noting here that there is no dichotomy between a Creative Commons license and copyright - that is, it's not that you use a CC license instead of copyright, a CC license is an implementation of copyright. This is so in the same fashion that licensing one of your images for use by a client is not an alternative to copyright, it's an implementation thereof.
By licensing works with a CC license (for example, attribution, non-commercial, no-derivative) you are not waiving your copyright. Quite the opposite, in fact: you are using copyright law to specifically define what you allow to be done with your image. This does not change the need to register your images quarterly, since you will still be relying on copyright law to award you damages in case of violation. What this CC license would do is:
1) prohibit anyone from displaying or using your work without proper attribution
2) prohibit anyone from modifying or otherwise using your work in their own
3) prohibit anyone from using your work for commercial gain
4) allow anyone to display your original work, unaltered, with attribution, not for commercial gain.
The only difference between this CC license and standard "all rights reserved" is #4. The legal advantage to the CC system is that it allows you to quickly and easily generate the legalese defining this set of permissions without hiring a lawyer. This will not in any way change the term of copyright (life plus 75 years in the case of individual authorship), or limit your damages should your images be used in a non-licensed way.
From a practical standpoint, it means that you can't litigate against Joe Blogger for putting your image on his blog, provided he properly attributes it to you. Of course, the real question is, how many times have you had to litigate against Joe Blogger for this offense?
That being said, the only advantages to a CC license such as this are:
1) the possibility of additional exposure for your work (akin to EMI's recent decision to release DRM-free music online). If you're an established photographer, fully booked with a steady clientele, this is likely of no value to you.
2) the ethical statement that locking up more and more of our culture is a disservice to the public good and the next generation. This may or may not be something you believe; if it is not, then this is also of no value to you.
In which case, a CC license is not for you, and there's no reason to not stick with "all rights reserved."
The only point of this whole spiel, though, is that it isn't a choice between a CC license and copyright. The CC license is simply an expression of copyright protection.