Column view is an excellent feature for super quick navigation in DT (at least in the way I’ve set things up for myself).
[Apart from the above, usability in general is still a very sore point in DT; but I’ll leave that for another thread.]
A) DT crashes after several switches between COLUMN and NOTEPAD views - and then inserting a new item with CmdN.
B) DT sometimes remains in Column View display althought the NOTEPAD button has been clicked and is hightlighted.