You do acclimate to caffeine, though. Caffeine blocks adenosine receptors, which would normally absorb the adenosine released into the brain, and as a consequence your body releases adrenaline when it tries to make you tired and fails. That's the real 'caffeine crash', the big bottoming out after an adrenaline rush. Keep ingesting enough caffeine, and your nerve cells respond by creating more adenosine receptors; that means you need more caffeine to block out the same amount of adenosine. It's not huge, since you are only talking about the tiny amount that gets into the brain, as the rest of the nerves don't respond quite the same, so 'addiction' isn't the giant issue that it is with other drugs.
This is not to justify the Mormon position about drugs, as my thoughts on the matter are "could I see the list of those available?", but to dismiss the idea that caffeine is somehow different from other drugs.