You are correct; it's just a vague shadow of the originals in the Glendale area where I grew up.
I've stopped at Calimesa three or four times; one thing they need to learn is that traveling diners don't want to wait 25 or 30 minutes for their Big Boy.
I see you're in Redlands - the home of my late USMC boot camp friend Joe Garcia; you can Googleize him under Frank Joseph Garcia. I still miss him and his great humor...he was KIA in 1967.