So I ran two characters this past week and only now noticed how differently I treated gathering on each. One I farmed nodes constantly, stopping for every vein and herb along the way, the other I ignored it entirely and just quested through.
The gathering one ended up with a pile of mats and picked up the Gathering Speed buff along the way, which does make travel feel snappier once you have it running, though I can't tell you how long it actually lasts since I never timed it. The other alt leveled noticeably faster in the sense that it wasn't stopping every thirty seconds, but it had nothing to show for it on the crafting side when it came time to actually make something.
What I took from it, just for myself, is that the two playstyles aren't really comparable unless you're also tracking profession income, and I wasn't. Someone with an addon logging gold-per-hour on both characters could tell me in an afternoon whether the detour actually costs time or just feels like it does. I didn't log it, so take this as one guy's impression, not a verdict.
Curious if anyone else ran parallel characters like this and actually measured it instead of eyeballing it like I did.