I have started to read Inside Microsoft Dynamics AX 2012 R3 and I read it from cover to cover. Sometimes you get reminded of great but forgotten features when doing so.
This time I was reminded of the Filter tab of the Find dialog. With this filter you can create any kind of boolean function to control what the tool returns of findings.
Here is a small example you can use to find methods with more that 50 lines:
Here I have used it on the SalesFormLetter class.