Breakpoints can still help you here. You really do need to use an IDE, because things like Goto definition, variable inspection live on breakpoints, being able

Breakpoints can still help you here. You really do need to use an IDE, because things like Goto definition, variable inspection live on breakpoints, being able to jump up and down the class hierarchy at a breakpoint and "find usages" will allow you to get a higher level overview of the project as a whole