Mh. Imo, the vertical layout looks much cleaner and comprehensible. Much more relaxing for my eyes, no nibbling on horizontal granola bar.
What do you consider to be too long?
In my own workflow, the Properties editor and the Outliner often are both in one column. I would consider it too long, if I have to shrink properties editor (to a degree I have to scroll for tabs) to prevent it from squeezing the Outliner to a degree I have problems using it productively.
In todays linux blender build I did not got the 2nd render tab, but it looks like there is enough room. Properties editor and Outliner fit nicely into a single column.