Swings and round abouts really, glass provides a wealth of information that can save your life or distract you to your death.
In the same vein, I find it easier to know exactly at what altitude I am at any moment in a climb (say 3,546) but glass gives me a better understanding that that is 1/2 a dial away from 4,000. It's for this reason the fuel gauges on the G1000 for example are still 'bar graphs' so you have a visual reference.
This I find becomes an issue for students who have learnt on all glass systems when on approach and to a lesser extent climb. They get obsessed with chasing a speed to the exact knot rather than making sure the needle is pointing around the right spot and playing with the feel of the aircraft. They seem to want to fly by numbers.
As others have said, it all boils down to a product of the training systems and what you are used to at the time.