I was hesitant to make a comment here, but things seem to have calmed down a little.
I do a lot of Macro, albeit it's all Underwater Imaging, I have two set ups for Underwater.
1DMK IV in a Seacam Housing, I find the APS-H format just get's me closer and for my Macro Imaging works better than anything else I've tried (FF/APS-C), primarily it allows me to better utilise the 100f/2.8 Macro L IS.
For everything else I use the 5DMK III again in a Seacam Housing, FF seems to the wide angle Imaging better than the 1.3 Crop of the APS-H format.
For me - shooting underwater macro - I am very happy with my 7d + 100L - (granted the 1d series + housing is a little out of my price range)
The reason I like aps-c is because of the greater working distance (not always necessary) but there are some shots I am sure I couldn't get on full frame underwater (and there is no port for the 180L on my ikelite setup).
I do plan to put together a FF rig sometime soon, but I will keep my 7d mainly for underwater macro.
Just my opinion in regards to my shooting.