I've heard very different things about minimally invasive valve replacement. Cleveland Clinic says it's now standard for aortic valve replacement, they only use a full sternotomy for more difficult cases. They also offer all types of procedures minimally invasive: mitral, aortic, tricuspid and either repair or replacement. I'm assuming not all of those are the standard, though.
My top tier surgeon, much like Norm's, preferred full sternotomy. Now, I did have an aneurysm graft as well, but that wasn't the reason. He told me that they do perform minimally invasive procedures but that it doesn't give good exposure and compromises the operation to a degree. According to the national data, he said there has been double the risk of surgical stroke. The problem had to do with getting all the air out of the heart, which is harder with limited access, and that air can in turn go to the head. This is my translation obviously, so forgive me if I'm a little "off", but from a non medical point of view, that's what I remember.
I'm a guy also, so scars are probably also less of a big deal to me. The funny thing is, my pacemaker scar is actually more noticeable than my sternum scar. I'm 10 months post op and everything is still plainly visible, even the drain tube holes. It's definitely gotten better, though, gradually fading. I'm a little skeptical how much it will ever disappear, but will just have to wait on that one.
Back to my main point, though, if I were going to Cleveland for example, I'm sure I'd feel more comfortable going minimally invasive, but probably still wouldn't do so unless I had complete confidence from the surgeon that they weren't sacrificing anything using that approach, not even a small percentage of additional risk.