Overall, I've been happy with my choice to work at Amazon. Compared to most other tech companies I've worked for, the hours are predictable and not that intense. Of course, a lot is asked of engineers during crunch time, but that's the same way everywhere in the industry. I like what I do. I like the projects I work on. I like my coworkers. I'm happy with my compensation.
In terms of perks, there aren't free lunches every day, but most orgs that I know of have some budget for a snack shelf. There are also other perks though - there are are opportunities to learn from other software engineers in the form of tech talks, internal conferences and the like. There are also opportunities to learn about the business side as an engineer.
I've generally found other people at Amazon very willing to help. I've had people outside of my team review designs and give feedback (and I've done likewise for other teams). I'm currently working on a project that's required me to reach out to a bunch of different teams to get input on how to approach a problem, and all of them have either accepted a meeting invite or responded to my email with the info I was looking for in a reasonable amount of time (a couple days).
Amazon has 14 Leadership Principles, and I've found that people mostly take them to heart. For example, it doesn't mean that you can use "Insisting on the Highest Standards" as a blank check to refactor your code to the point that it's immaculate, but it does mean that most of the product people I work with get that tech debt is a real thing and slows down product development at some point, and they will budget time to address tech debt when given suggestions by engineers.
Most of the people who have left our team in the past 12 months have left to go work on other teams. Some of them left to work for a different org, some because they wanted to work in a different office.
Amazon's not perfect, but it's pretty good, and most of the things that are frequently raised as issues on HackerNews are, in my experience and the experience of everyone I've talked to at Amazon, generally not issues.