I do not recommend spending additional money for a PH ticket unless you have only one day for both parks. You can see most of the major attractions in each park each day with discipline and a good touring plan. Rides are rarely down for an entire day. Provided you are spending the same amount of hours in the parks whether you hop or not, you are giving Disney additional money for a PH ticket and getting only the ability to move from one Disney place to another. In other words, you are not getting any additional services from Disney in return for the extra PH fee - Disney is still paying the same amount of employees to operate the same number of attractions no matter where you are. The only other benefit I could see is if you had EE or EMH and used it, then hopped to the other park for the latter part of the day to avoid larger crowds in the EE/EMH park. But even then, I don't think the typical difference in crowd levels between parks on the same day is enough to justify spending the extra money to hop. I personally have never done EE/EMH or hopped except for one time years ago when I only had one day for both parks.