I too like having floor plans but the floor plan itself usually is not a determining factor in whether I book a certain type of room. However, I am more likely to book at a hotel which have floor plans as opposed to those who do not.

I also like hotel room pictures but this is a double edged sword especially if you receive a room that looks nothing like the room in the picture on the website. This happened to me at Le Bristol in Paris where the room we got was nowhere near furnished like the "representative sample" photo on the website. In fact, there was a lack of furniture and looked like the decoration budget had run out.