I would imagine being struck while on the ground would have made the affects worse since the plane was "grounded."
Just like a car, the plane is NOT grounded as it is sitting on inflated rubber tires ;-)
On a side note, I was on a flight from MSP to DEN last weekend and our plane got struck by lighting a few minutes after takeoff. Bright flash and loud bang on the right side of the plane. I thought at fist an engine blew up.
We continued without incident to DEN.