The way the GF works is that standard rooms can be booked as either a garden or lagoon view. Garden could mean actually overlooking a beautiful garden, a partial building/garden view or even the marina is considered garden. With lagoon, you could overlook the beach area and the Poly, look off into the distance at the CR and Spaceship Earth, have a side view of the MK or even a full on view of the castle. Other than booking "garden" or "lagoon", anything else is simply a request.
For SugarLoaf, as Jel0511 mentioned, there are 2 views available, either garden or marina. Neither overlooks the MK directly, but you could possibly still see the fireworks from your balcony with a marina view. As with the standard rooms, you can make a request for a specific view and also within SugarLoaf, you can make a request for a lodge tower room instead of a standard room (if your party size meets the room occupancy requirements). For either of these requests, there is no additional up charge.
The Main Building is similar. What you are guaranteed, is a room in the category that you booked, ie: standard, deluxe, honeymoon. From there, you can make a request for a specific view with your pre-planner. There are 9 or 10 honeymoon rooms that overlook the marina with a dead on center castle view and there are 18 or 20 standard rooms that also have this same view. We had room 4404 on one of our trips and it had a beautiful view. Other views can include the center courtyard area and the beach/lagoon.
With any room in the resort, you can request a certain view type. They'll try their best to accommodate you.
I wouldn't base my concierge choice on view alone, especially at the GF where all the rooms have pretty nice views. You might have a better chance getting exactly what you want by staying concierge and requesting it through them, but again, nothing is guaranteed.
Tammi