Right. However, the EFIS is not necessary for the glide slope or approach. It is there to give you a visual reference. I only use it if I am flying VFR. I do not think it is necessary for ILS at all. Plus, when you like to see the effect of the runway coming at you, those telephone poles or red squares really ruin the effect. If you program your Autopilot correctly to follow the glide slope on approach, then you will never need the EFIS.

It you use your Autopilot for a nice ILS / glide slope landing, simply put the GPS/NAV switch on NAV. Then, enter the ILS frequency into the NAV 1 radio and press the button on Autopilot for APR (Approach). Then, your aircraft will follow the glide slope right down to the runway. About 100ft off the runway, turn off Autopilot and flare up then reverse thrusters and you have just earned yourself a nice safe landing.
Note: Depending on the plane, I press the IAS button and lower the Indicarted Airspeed to about 160 knots in a Learjet and about 170 in a Boeing.
I hope this helps.