Yes - the only variation is the new Tower at the Contemporary.
The other properties you can walk up and through without issue. The question is always on parking - the parking lots are controlled. But if you are a guest elsewhere on property its a non-issue, and you can always let them know you have reservations, etc.
Please just do not perpetuate the problem of people using resort parking instead of the normal lots to visit the parks.
All of the properties the parking is adjacent to the hotels. Some of the larger properties have little carts to help people with luggage, moving around, etc... but in general you just walk from the lots to the buildings.
What I was referring to is often people cheat the system by going to a resort (like the monorail resorts) park there, and then take the monorail to the parks. Thus not paying for parking, or feeling they are entitled to a slightly shorter or less crowded path to the park. But in return crowding lots unnecarrily and eventually forcing Disney to get more strict about parking or making things more cumbersome for everyone (like dropping certain direct routes) to discourage the abuse.
The theme park parking lots have trams that pick you up near the parking rows and take you to the ticket areas at the front of the park. At the MK, the trams take you to the TTC, where you take the monorail or the ferries to the MK itself.
Visiting the hotels is a fun way to past the time. Sometimes, if you are thinking about staying at a particular resort in the future, you might think about getting on a bus to that resort, and checking it out.
Visiting the monorail resorts is fun. On my last trip, I did that myself. I planned to eat a late breakfast at the Polynesian Food Court, and I had dinner at the Contemporary one.
It is really fun to walk to the Epcot resorts. You can check out the Beach, and Yacht Clubs, and take the ferry over to the Boardwalk. They are all fun places to walk around. It's fun to do a little daydreaming about staying there.
I think you are O.K. to check things out, as long as you don't try and use the swimming pools. I know that that is not allowed.
On one of my vacations, we made a Priority Seating at Boma for breakfast, and then afterward we checked out the Animal Kingdom Lodge. It was fun, and the animals are amazing. We then went on our way to Animal Kingdom for the day.
I believe some people call it resort hopping, and you could actually spend a day doing it, so as to not use a day off of your park pass.
I do know that but suppose I want to go to a restaurant at the Grand Floridian. I can park at the TTC and take the Monorail or Ferry to the MK and just hop on the resort monorail?
You can take the monorail directly from the TTC to the GF too... but you'll be paying for parking at the TTC unless you are a hotel guest at Disney. And if you were, you'd be better off to just park at the GF