It is preferred for me if I am performing certain tasks. If I am rapidly editing html/css then I like to be able to see my markup and a preview in a browser at the same time. Whether this be accomplished by two monitors or one monitor with sufficient resolution does not matter.
Reading API documentation while I code is another good use case for multiple displays. It gives me a quick at-a-glance ability that I can't achieve with alt tabbing on a single monitor. (I can, it just feels a lot slower because I am constantly having to visually relocate where I was within the document)
I refrain from saying that it is a "MUST" or is "REQUIRED", because I can by just fine on my little 15 laptop, but I prefer working on my dual screen setup.
If I'm going to go with just one larger monitor, a nice tiling window manager is nice. Otherwise, I can just alt-tab to the other screen.
Reading API documentation while I code is another good use case for multiple displays. It gives me a quick at-a-glance ability that I can't achieve with alt tabbing on a single monitor. (I can, it just feels a lot slower because I am constantly having to visually relocate where I was within the document)
I refrain from saying that it is a "MUST" or is "REQUIRED", because I can by just fine on my little 15 laptop, but I prefer working on my dual screen setup.
If I'm going to go with just one larger monitor, a nice tiling window manager is nice. Otherwise, I can just alt-tab to the other screen.