1. Doesn't affect the other parks at all.
2. Friday shouldn't be bad at all. In fact, if you want to go to the Studios during the weekend, the lines for the attractions will be very manageable.
I've been to the Soaps Weekends only as an observer. I used to watch the ABC soaps but the job kind of got in the way of that. I can tell you from pure observation that the people who are there for the Soap Weekend are there FOR the Soap Weekend. They don't really give a flying fig about riding Expedition Everest 14 times in a row. They will probably say "Toy Story what?"
I am stereotyping anyone but 99% of the people there at the Studios for that weekend are die hard fans. They record the shows if they can't watch them that day. They know the exact date Luke and Laura got married. They mourned when Shell Kepler died. They can tell you all of Viki's personalities. They know all of Erica's last names.
The weekend shouldn't interfere with your plans at all.