I agree with babar41 - not worth it, especially since if everything goes exactly right (plane gets to gate on time, you get off plane right away because you were sitting in front, no lines at ME check in, ME bus leaves right away, no lines to check in at FtW, you board boat to MK without a wait and it leaves right away and doesn't stop at WL first, no lines left at securtiy check or entrance turnstiles,), I think the absolute earliest you could get there would be about 8:30 pm.
For me, it would be way too much money to spend for 3 hours or so.
Besides, it is likely you wouldn't be able to get there even that quickly - what if you can't get there until 9 or 9:30 or even later? Would you be OK with spending over $200 just to see the fireworks and late parade? Will you be too tired after traveling?
Best wishes -