I run 2 - 23" monitors and yes I still keep line length to around 90 chars or less usually. Mainly because I still go mobile on my laptop and it helps to have source readable on smaller displays. Not that I probably still couldn't go with longer line, so it is just a personal cut off nothing more.
The one in the middle is 24", the two on the sides are each 22".<p>I do not limit line length intentionally, but it's quite rare that a line of code would go over 70 characters or so, and that's good enough for me.