How much engine vibration is normal?

[Frankd1]

Hi everybody,
I noticed something yesterday that I found odd:

After driving around for a bit and with the Yaris warmed up I popped the hood and noticed the engine vibrating what I think is more than normal while at idle.
I know that with these motors as well as others there is always a bit of valve train noise which is normal but it was the vibration that caught me off gaurd.
I realize that a 4 cylinder engine is not going to run perfectly smooth but this seems like a fair bit -you can see it in the plastic cover over the top of the engine and it transmits to the air filter box and associated hoses as well as to the hose with the rad cap on it.

I dropped by the dealership this morning and pointed it out and the tech said that it was normal for these motors.

He sat inside and could not feel excessive vibration through the car - you can feel a bit if you put your hand on the passenger seat headrest but its not would I would call abnormal.

I also realize that these cars have their idle set relatively low but it just seemed odd thats all.

I know it would be difficult to tell without seeing it....any thoughts?