More usefull data

When you get to the later stages of the game, finding bottlenecks becomes fairly important in order to meet the minimum amount of revenue. However, at this stage the game doesn't provide too much usefull information when and where the bottlenecks are. Could we have stats displaying average walking time, a more detailed display where the patient is between the point they arrive and the point that they leave (and why), etc. This kind of information would be extremely helpfull finding out why certain departments aren't working as well as they should.

I agree!
I'd also like to see statistics, both global and by department, on causes of unhappiness for patients and staff (the same you get if you hover over the star rating with the like symbol). Seeing if they're getting access to seats, water, food, restroom...