As someone who has worked in a warehouse facility as a picker - though not Amazon. I find the 'slave-like conditions'a bit unfair.

Now I can't speak for Amazon themselves, most of the complaints seem to stem from the fact that being a picker IS a skill. Not everyone can be good at it. It's physical - which I personally found fantastic, getting paid to stay fit, and on company time. You need to have somewhat a good memory, but more importantly an analytical brain to process the information on the scanner. Whilst the locations of the items might not have any seemingly logical order, the layout of the facility does. If you can process the bin locations immediately then you save many seconds of your target. Which brings me to the targets. It may seem 'slave-like' to have a timer between picks but each and every one is achievable (through analysis of every other pick ever made), and even if you miss a pick by 5 seconds, you've probably saved 5 seconds somewhere else during that same day/week/month (depending on how they evaluate your performance). Again though that's no to say that everyone has the skill to do so.

The episode you highlighted mentions that employees at Amazon tend to enjoy their work. If you can do the job, there's very little stress, pay can be good - we're talking about a generally unskilled job, certainly more than most retail stores. Decent benefits - vacation, healthcare etc. Shifts can be very favourable depending on the facility - 4 in 4 off can mean long weekends and plenty of opportunity for family time.

Some days I wish I was just picking.