I haven't been to the Decatur one in years. Its very small and for the most part its pre 1960 parts. Also it's usually a mud fest and the few buildings are darker than a cave but with more crap on the floors than a cave. Its not far from me and I *may* go this year (next year)if its not muddy.
It is nothing like what Pate used to be. It is it's own animal and very different. I rarely ever found anything to buy years ago so I quit going. I will say that the grounds are looking to be much better kept now. I have been by there a bunch lately and they have removed many of the extra nuissance fences and smoothed out allot of the big dips and ditches in the fields.
If you do go don't park in the field on hwy 51 on the south side of the grounds. Go up to the next entrance on the north side and you will park in the back over the bridge in a nice treed area that has some gravel instead of sticky clay.