I would show up to TTC for the MK about 60 minutes before park opening. That is because you will have to still take the monorail or ferry after you park. I would show up about 30-45 minutes before any other park opening just to be safe. Other people might have more accurate times though.
I will say if you want to Rope Drop the MK during the busiest times of the year (4th of July/Christmas/New Years), plan to be at the MK TTC parking entrance about 90 minutes before park opening. I have seen the traffic horrendously bad from the monorail heading to EPCOT.
Add an extra 15 minutes for the ferry. We just got back and they never offered the monorail option for people coming from or headed back to the TTC. The ferry will probably be quicker on more crowded days than ours though - our ferry waited until it was reasonably full to leave whereas on a crowded day it would fill up much faster. We drove to every park all week and found it to be an very easy and convenient process. No issues at all. Absolutely do not let the parking attendants talk you into the preferred parking - if you are early the regular parking is probably in Aladdin, only a couple rows over from preferred.
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