How do I find a specific table in my EDMX model quickly?

If you go to the Properties window in Visual Studio 2010, you'll see an alphabetically sorted list of entity types (e.g. your tables) in your EDMX - pick the one you're interested in, and the visual designer should realign itself to actually show that table in view:

In main menu select View > Other Windows > Entity Data Model Browser (it usually opens in the same panel as Solution explorer).

You can navigate the tree list or type the table in text box.

In the "model browser" you can right click the Table and choose "Show in diagram" in the context menu

Click in an open area of the designer:

Go to the Properties tab:

In the dropdown box at the top, select your table. You should then see it highlighted in the designer.