The one feature which keeps me partly tied to version 2.1.1 is you cannot copy and paste data from a query in XLS or XLSX format for analysis. Sure, you can save to a excel.xml file and the look for that file and open it, but this is so much SLOWER that Exporting the data to the clipboard and pasting it into a worksheet.
I guess I am 'old school' figuring that getting things done quickly with a few keystrokes is better than the more fiddly 'modern' user interfaces.
How do you mean?
I just copied a range of cells from SQL Developer grid in 4.0.1 and pasted into Excel (an xlxs workbook) with no problems.