Our operation is dumping the obsolete database we've been using and is moving to Oracle. I'm currently taking a PL/SLQ class that's using SQL-Plus. I cannot believe that Oracle got as big as it is on the strength of these lame tools! What tools do you developers really use to build a database application?
As you've found SQL Plus isn't really meant to be a development tool, Probably the most popular 3rd party one is TOAD (Quest software) you can get a trial download of this from their website http://www.quest.com