I'd say a good 20% of my kills as Paladins are call lightning. If you are convulsing on the ground and you flee from me you are getting lightning bolted and dying.
To answer his question though holy bolt isn't really worth it. You will only actually notice it come into play when someone has lightning shield from an invoker, otherwise it usually doesn't matter who you're fighting, if you have light of heaven and they don't have dam redux because you dispelled it they are taking ==oblits=== to <<<ANNIHILATES>>> regardless of edge.
And to answer one of his concerns...call lightning stopped caring about weather due to an imm fix many many years ago.