There is of course a drop off of about 200-400 dollars after the first semester, but the individuals I spoke with said it continues to go down, not as dramatically as after the first semester, till it essentially plateaus for your final two semesters as a senior.
UF is extremely expensive, I think it may only be behind Alabama and Georgia when it comes to dues. I really don't know why it is so expensive since almost all other Florida schools are 500-1000 a semester. Who knows