SEE makes a variety of aditional tools available through the plugins and themes, for example the ability to actually see real time what your DragMath inserton will look like, for a student to actually edit and submit a graph, to use ASCIIMathML, to have access to a graphing calculator.
So, the short answer is that if all you want to do is decouple DragMath you need not bother with SEE. If, on the other hand, you want to provide your teachers and students with a set of extraordinary math tools, then install the plugins and show them to your Math teachers and see how they respond.
Frankly, at some point I suppose someone will have to take some Math lesson and then demonstrate point by point how SEE could impact instruction. I have argued in the past that Math on the web needs to be transparent and universal, and I look at SEE as a vehicle that may take us in that direction, a young Maths babblefish if you will.