I guess the way to think about it is that 1900 width on a 26" monitor is very close to 1024 width on a 15" monitor (because the monitors are measured on the diagonal). So if you like the way your screen looks at 1024 width on a 15" monitor, you would notice no difference in text size moving to a 26" screen and 1900 width - there would just be more on the screen at once.
I can easily open two applications at once and work on them side by side, or for that matter, read a document with two pages open simultaneously (like reading a book). Of course, if I ever want to increase text size, I can always just hold down the "ctrl" key and use the wheel on my mouse to increase or decrease it on the fly (without changing screen resolution).
Try it!
The benefit would be the ability to view large images while at the same time having larger and more legible type.