Hey =)
I stay at orange lake twice a year, my family has a time share. We've been going for 6 years now. It has definetely changed a lot and grown a lot since we started staying there.
They have a new area called Splash Lagoon. It has a gigantic lazy river, private cabanas that are $99 for the day - worth it for the privacy & for all the things that come with it, a really nice tropical pool, an outdoor bar & grille....so much. They also have new 3 bedroom condo's in the new area that are really nice. The whole area is pretty much brand new, and it feels like you're in the Carribbean when you're there.
They still have all watersports & night time events by the other 2 pools that you probably were at last time you were there. That's fun to do at night, it is usually themed. They have pool bingo at 2 or 3 everyday and in the summer you can win up to $300, it's worth doing if you're by the pool at that time.
As for transportation, we got a shuttle once from the resort to the parks because we didn't have a car. I really don't recommend it unless you have a lot of extra time. The shuttle made about 6 other stops at least before it headed for the park. The stops were all to other time shares, some that weren't close to us at all. It took well over an hour to get to the park. I'd definetely recommend just calling a cab from there and having it take you directly.
It's not a far drive, maybe 10 minutes from the parks. You just follow the signs right from the resort. If there's no traffic you can get there even quicker than that. But if you don't have a car like you said, my recommendation is to avoid the shuttle & get a cab. The shuttle is just a pain I thought, unless you have more patience than I do.
PM me if you think of any Orange Lake questions that I can help you with. I will also be there in August so I'm hoping it's nice out!!
Jamie