I don't know if that's true, but it sure seems like it. Commercial breaks can last as long as 5 minutes, then 11 minutes of show, then commercials for the next three. I haven't actually done any serious research on this, but occasionally I use a stopwatch and time the programs just to make sure I'm not imagining the commercial breaks are overly long and frequent.
Every so often I forget what I'm watching because the commercial breaks are so long. I try to remember to record the shows I want to watch so I can fast forward thru the commercials.