which is more complicated, running in circles or hitting 3 and 4 on your keyboard in rapid succession? Or is it doing both at once?
Seriously though, it takes all of 2 minutes to get used to doing and almost nothing up until level 10 (and further in some cases) can survive a double cleave, and when it does, it will die the next hit. With only a 6 second cooldown on Cleave and Great Cleave you can do it nearly nonstop, since it generally takes more than 4 seconds to run to another group of monsters. I used the Starter Greatsword on my Barb until I got a Bloody Cleaver at level 12, so you don't even need a decent weapon for this strategy. The gain is also much more than minimal, especially at lower level.
And UMD on a barb, even a Pure, is a good idea (some numbers below). At 4 a level for human you have balance, spot, jump and UMD, taking 2 out of jump for tumble. Intim IMO, in its current long animation, easily interruptible state, is nearly worthless. Even with the old animation, If you need Intim to pull agro off someone that shouldn't have it in the first place, reroll, upgrade gear or tell them to slow down.
some UMD numbers:
Since it is hard to get any UMD boosters before level 7 or 8 and taking more damage starts to happen about level 9 lets start there.
1 Cha (8 base +4 item)
3 Item (Persuasion, Cartouche, Bunny Hat)
1 Luck (Voice, Stone of Good Luck)
That is a sustained 13. Add another 1 if you have Phiarlan Carnival and can get Big Top. Human Versatility III for another 4. That gives you an easy short term boost to 18, which is a 70% chance on Cure Mod wands and lets you equip ML 11 RR items. Now lets stretch it a little, 2 for GH (got lucky in XC) 1 more for Charisma (+2 tome) and 3 for UMD Focus, that's a no fail Cure Mod Wand for 20 seconds.
Now Level 20 with a few easy to get epic pieces (P Epics), a junk ToD ring, A tier II Shroud Cha Skills and a DT with Cha skills 3 Exceptional Cha 1 (roughly 2 weeks of play 2 hours a day not including trophies).
6 Cha skills (Shroud 1&2, DT 3)
5 Cha (8 base 2 tome 7 item [Shimmering Pendant] 3 exceptional [2 ToD, 1 DT/colorless slot])
3 Enchantment (Epic Big Top)
1 or 2 Good Luck (Crafted/HoGF/Green slot)
Gives you a 33 or 34 depending on what your Luck is. A +2 shrine gives you 35, UMD focus or HV II if you somehow find room is 38, eek out another 1 (10 base Cha, +3 tome + Litany, +4 tome, HVIII ) and you have No Fail on Heal Scrolls. Yeah this set up requires either a large cut into DPS gear or a lot of swapping, it is still pretty easy to do and once you get better gear you will need less swaps to do it. My fighter will be able to No Fail Heal Scrolls with 2 item swaps (Shroud Cha Skills for X Boots and Epic Spyglass w/+2 Good Luck for Epic Gem of Many Facets), leaving 95% of my DPS intact. If you want how I can give it to you.