Counterpoint: I like shopping at Amazon. I used to work there too, but I liked it prior to working there, and continued to like it after I quit.

And I think it would be very difficult for a company to offer the level of convenience and good UX that Amazon does at a much smaller scale. For example, part of why they can get very fast shipping down to a reasonable price is their huge network of distribution centers + their size giving them leverage in negotiations with UPS/Fedex/et al.

If you split Amazon into a dozen smaller companies, the overall customer experience would likely be worse.