If you have giant migration scripts, for whatever reason, this tool is the only migration engine that would not choke on them.
Can you link some examples that you think would gladly process data-migrations that are 1-2GiB large?
psql -d mydb -f migration.sql
I use a home-built solution that does this (160 lines of go), doesn't seem very exotic to me and did not require lots of work as there are only a few requirements for a working solution: Unique ordered names for migration sql files, use the db to store metadata about migrations run, use the db tools to run migrations.