Okay this is kind weird but pretty much, Is there a way to place down models like you can place down blocks in games such as minecraft and others?
Drag a new window from the handle on the top left of the viewport. Make it a 3d view window and position it next to the other 3d view window. Then, build up a library of props and set them off to the side in the second window.
I would enable snapping just to make it more like Minecraft at this point. Now, just copy and past from one window to the other, and Alt+G to center the object in the middle of the construction area.