On the NJ Tpk. thread it was theorized that the toll gates on the nb off ramp and sb on ramp at GSP exit 4 (NJ 47) were designed to soak the motorists headed between the Cape May-Lewes Ferry and the Wildwoods. Did the tolls at exit 4 exist prior to 1964? The CMLF didn't begin service until the summer of 1964, almost a decade after the Parkway opened.
This is an interesting theory, as those ramps didn't exist prior to the CMLF opening. According to Historic Aerials they were built between '63 and '70, so the case could be made that they were in fact trying to squeeze ferry traffic, or they were just attempting to subsidize the cost of the ramps themselves.
Trying to do a perusal of the Internet looking for stories from 1963-1970, it's coming up blank regarding the interchange.
The intersection with (today's) NJ 109 and US 9, slightly to the west, received a substantial upgrade around the time of the Ferry's opening, making it easier to use US 9 North to NJ 47 to get to Wildwood.
However, at Exit 0, it's a reminder that the original interchange wasn't improved upon around the Ferry's opening. The main throughput had sent traffic on Shore Road towards Cape May with a small median cutout to turn north as if it was a secondary thought. Not only was this condition never improved upon when the Ferry opened, it remained in its original condition until 2014 when it finally received a much-needed revision.