I would tend to disagree with glass cockpits not displaying as much stuff at one time. On a SINGLE screen of the (5) that we have available at one time... we have:
EHSI, ADI, TAS, CAS, GSP, RNP, Wind direction/speed and correction, SAT, TAT, FMS NAV, VOR, LOC, ADF, Waypoint, distance, DME, radar... and more! That is just on the PFD, there is at least 10x this available on the MFD and the EICAS. Transitioning from steam guages to glass can be a little daunting due to the ammount of information available, over a little time your brain learns to determine what is important at the time and what is not. You simply cannot keep it all in your scan at a given time. Glass cockpits have allowed the avionics manufacturers to cram an INCREDIBLE ammount of information into a small space, because there is no longer a need for an "instrument" to display it... it is simply a value calculated in the MAU's of the aircraft and placed in a 3/8" section of a 6" x 10" screen. It is incredible what these things can do nowdays!