Hi
We've used the I4 from disney property for the past 6 years, and from the Formosa Gardens area for the past 3 years and never had a problem.
We usually find the 192 -> I4 can get delays through traffic, but on these occasions we have taken the Sherberth Rd shortcut from Formosa Gardens to Disney, and then got on the I4 from there.
Some of the recent issues on the 192 have been caused by the 192/I4 intersection road works, which seem to have been ongoing for ages now, but I am unsure when they are due for completion.
Anyway back to your question, as others have said use the I4 either from the 192, or via disney, it will still be much faster than the alternatives.
Paul