The layout is relatively simplistic. But it's not like RCT at all. Every single element on your ride is completely and totally shaped and controlled by you, whether you make it in elementary, Newton2, purgatorium, or by hand in the editor.
Hand building takes a lot of years to refine before you can start churning out rides that flow and lack bumps or pumps. So don't get frustrated if your first ride turns out wacky and crazy.