I have a colleague who has 2 monitors at work.But only uses one, other is switched off

Tried convincing. Did not work. He just prefers one. I just do not understand.

Anyone else prefer just one monitor and alt + tabs? O.o

I have three, and I use two and one is nearly never used. I sometimes switch to just one for a while because screens really fucks with my ability to sleep over time.

I'd rather have a bigger screen with 16000x9000 resolution, but I probably won't see that soon enough.

I prefer one 21:9 screen or using win+tab, i tend to procastinate if i use 2 screens

I prefer 1 monitor and 2 windows side by side. Have 2 at work, the second is rarely used.

Use two all the time

I use one and only one. Tried two, never used. Also I often use my laptop for coding. Using the single monitor in office is like keeping the similar setup.
I use Gnome and about 3-5 virtual desktops.
I have tiled terminal and it's semitransparent. That way i can read the doc underneath it and use it at the same time.
Speaking on IDE. I use Eclipse and it has marvelous possibilities to tune the UI. I have the code editor, console, build log, outline and errors view visible altogether.

Get a 5k iMac and you will never need a second screen ever again.

@lig1 ah, interesting...