It's obviously been written by someone who know the parisians and their subway very well. I stopped counting how many times I was just about to kill someone for one of those reasons (and numerous others, like someone taking freaking ages for entering the car while all the empty seats get snapped before your eyes). Now I'm much, much happier on my bike though.
One useful, handy, serious tip I can share: to calculate how much time you need between two subway stations, count 1 min 30 s per station (or count the number of stations and add 50%) and add 5 min for each interconnection between two lines if any (more if you don't
run walk as fast as a parisian ;-) ). It's been working just perfectly for me for years.