If I could get my hands on the developers who wrote all the snowflake log formats I had to deal with on a daily basis back when I was doing support and ops …
I cannot emphasise enough how much better it is for searching the logs and running any kind of automation off of the logs (analytics, monitoring, alerting).
"Noisy" logs are often cited as a major problem, but well-structured logging allows you to filter out the noise very easily, and focus on only the log events that are relevant to your task.
Using them from the command line? Reading them just here? Don't exist anything alike "nano server.log".
And if you are building something serious and with some sort of scale then you will need to have something like ELK stack anyway to aggregate and display data - there is no getting away from that.
Working with unstructured logs however is a mess. Perl / Awk helps of course but it is a lot of extra effort. And in the end, at scale you will just be writing those scripts to turn that mess into structured data to feed into that same ELK stack anyway.