It is good to know that it is possible to view cross-references for kernel classes, tables, enums, etc. This can be done by using "System Documentation" node in AOT.
For example, to view cross-references for lookupField method of the Args class you can do the following:
1) Navigate to the "System Documentation\Classes\Args\lookupField" AOT node
2) Open context menu
3) Navigate Add-Ins\Cross-reference\Used by