My first MacBook had 40GB of hard drive space! Times have changed. But given how laptops are the new normal, requests for 32 gigabytes of RAM are quite reasonable.
People running multiple virtual machines have a great requirement for this, and I've been in this situation before. People working on large image files also have a reason. While we can all get by with less, memory is at a state now where more can actually help a lot of people for a reasonable price.
Since the is the first revision of MacBook Pro computers with this form, the next release will probably not be far away. We'll all be having gigabytes of fun.