If you wanna talk fitting SDC into other parks, Disney is probably the best for comparison.
Silver Dollar City is 61 acres currently. You can fit 8.4 SDCs into Animal Kingdom (510 acres) [the safari alone covers 110 acres]; 4.9 into Epcot (300 acres); 2.2 into Hollywood Studios (135 acres); 1.9 into Magic Kingdom (117 acres); and 1.4 into Disneyland (85 acres). <NOTE: The acreages are what I found online, so I don't know exactly how accurate they are.>
Disney has the advantage of flat land. SDC is on top of a mountain, as well as a huge cave. So considering that, I'm really rather impressed at how far SDC has been able to expand thus far. As for Cedar Point, being that it's on a peninsula (right?), they have to cram a whole lot of stuff into a tiny area. SDC, on the other hand, has breathing room, which I like, because it means it doesn't feel overrun with stuff.