I use TOAD for all Oracle database management and development. I've also purchased it for our developers. The resource time I save by purchasing TOAD for my developers easily offsets the cost.
We are a smaller software company and maintain an Oracle database to test new releases. We do database administration, design, and development.
Database management includes tablespaces, data files, rebuilding indexes, tables, analyzing tables, and schema comparison.
PL/SQL development includes creating and maintaining packages.
SQL includes data queries and editing.