I always have a portrait monitor if I can help it. For me, it's more natural to be able to see longer chunks of text/code. Less scrolling when reading. Only

I always have a portrait monitor if I can help it. For me, it's more natural to be able to see longer chunks of text/code. Less scrolling when reading. Only real problem I've found is when idiot web designers who think everything is landscape and/or all monitors are >1024 px wide.