The end goal should be improving the median quality of life, through improving the efficiency of factors of production -- lower cost of goods... not through the expectation that the wages should arbitrarily grow linearly with GDP.
Around one hundred percent. https://data.oecd.org/lprdty/gdp-per-hour-worked.htm
But it's not just warehouses: efficiency changes have been top to bottom throughout the world. Things like Six Sigma, lean manufacturing, the Toyota Production System ... these have been massive drivers of efficiency nearly everywhere.
I worked manufacturing IT and was able to watch the assembly process. It's frankly amazing and us programmers have lots to learn. The worker that bolts widget A to widget B doesn't just have a box of bolts and a wrench. She pre-places the bolts in a pokayoke tray and places test templates against A and B. Are they misdrilled? Push a button on her console and they are diverted off the line for rework. Good? Templates off, place the assemblies in a work tray that can hold them in exactly one - the correct - configuration, pokayoke tray goes on and nuts screwed to bolts.
The count of nuts and bolts in her station are measured based on flow in/flow out and a runner brings and places more just in time to prevent her station from running out but not before they accumulate at her station. The environment and process is designed to absolutely minimize operator motion, with a supervisor monitoring and filling out time observation sheets to look for wasted effort and opportunities to change.
When I talked with some plant supervisors it was incredible: they were able to point to a manufacturing station and say "this worker takes twelve seconds to execute these five motions", and you could pull out a stopwatch and that was exactly what you would see.