That's the traumatizing way. Not bad if you have one mapped function. Terrible if you have dozens. Stepping through code should not require setting more than one breakpoint - but if I have to find where a set of chained method calls goes wrong I have to breakpoint-binary-search to the problem.

When you have "if" statements, you can press "next" repeatedly in Eclipse/IntelliJ/whatever and step through the code. When you use chained method calls you're constantly going into and out of function calls, and all the local variables become return values that you don't ever necessarily get to see in a stack frame, and sometimes you have to step through loads of boilerplate to see the next interesting line of code, even when you're doing something totally simple.