Being ABAP developer I often need to look up syntax of particular ABAP statement. Similarly as in discussion here I think that coding itself as activity in any of programming language is “state of mind” thing and rest (like in which language is the code written or what syntax it has) is not that important. Therefore I really like features of ABAP IDE either in SAP GUI or in Eclipse which helps me with syntax. Using e.g. auto-completion tool helps me to focus on the code and not on what the syntax of any particular syntax is. Because as said already; the syntax is not that important.
Furthermore often I need to look up some more documentation about the ABAP statements. For this I use couple of t-codes that help me all the time:
ABAPDOCU Display ABAP Documentation - display popup called “ABAP Keyword Documentation” where I can review documentation from different standpoints like ABAP Reference, ABAP − Release-Specific Changes, ABAP Programming Guidelines, ABAP Glossary, ABAP Index, ABAP Examples, ABAP syntax diagrams, etc.
ABAPHELP Search ABAP Documentation – display small popup with search term field where it is possible to enter any ABAP keyword and to get an documentation for
ABAP_DOCU_SHOW Call ABAP Keyword Documentation – same as ABAPHELP