Eurofighters are very smooth in most parts. Dollywood's Mystery Mine is smooth before the tressel, and during the last 95-degree drop, and inversions. Its rough during the first helix if you are in the front. I don't know about other Eurofighters though.
The Flooded Mine closed down in 1997. I have a 1997 map, and it is still on there. I have heard that snake story too, and I am from the Tri-Cities area in east Tennessee. I have also talked to Daredevil Falls employees about the Flooded Mine, and why it closed, and they told me that it was due to maintnence. The Flooded Mine will always be a Dollywood classic.