When we renewed our BGW passes in December, we opted for the 2 park Platinum pass because we knew we would be moving to Florida before it expired. It is fantastic! Any A/B park in the country, and the EZ payments are great! For us, since we got a great deal ($199 per person for renewel before 12/31) we owe $24 per month, and never miss it! It comes right out of our checking account, since we used the bank debit card.
As for the free Preferred Parking, that is not a perk in BGW or Water Country, USA...it is only discounted. You can park in the regular lots for free, just like with the gold and silver passes.