Meh, I am an engineering-minded person, so the value of FTB is in its ability to create/integrate/calibrate/improve autonomous systems. TC doesn't sound like it would give me much entertainment in this realm, compared to others, nor does it provide me any valuable output that I would otherwise be able to utilize in other systems, such that I have more opportunity to do the create/blahblahblah-ing of autonomous systems.
Golem-automated farms have absolutely no running costs. They can do any kind of plantable crop, they can replant them automatically, and with upgrades can service a pretty large area. You can also automate treefarms with them, again, with no running costs whatsoever. TC Axe of the Stream beats TiCo Lumber Axe, if only because trees felled with the Axe of the Stream decay leaves insanely faster. Hoe of Growth is basically infinite bonemeal if you get repair on it. Runic Armor is one of the coolest things that have been added by a mod thus far. Extra hearts that regenerate themselves very fast, armor doesn't render on your skin, and you can upgrade them to become even better - recharge faster, have more extra hearts, provide more normal armor... Very useful especially when mods start adding mobs that largely ignore armor. TC adds the Warding Focus, which you can use to make any block unbreakable by anything, and only you can unward the blocks, so major base protection. Also, Arcane Door and Pressure Plate for even more security - only you can open the door, but you can make keys and give them to friends if you want them to be able to enter you base as well. Extremely useful on PvP enabled servers, very few ways of getting around it. Lightning Focus gives you a very powerful ranged attack, something not many mods add.
There are many useful things in thaumcraft for automation. And most of the things in TC have no running costs, but can be sped up if given a certain essentia to help it along. Things like Arcane Lamps, Lamp of Growth, Lamp of Fertility, the Arcane Bore... Speaking of the Arcane Bore, what other mod adds a quarry that does enchants like fortune and silk touch? The Arcane Bore does it. Other ones i know of is Mekanism Digital Miner and Quarry+ - But those take power, and a LOT of power. Arcane Bore can run, albeit more slowly, without any running cost except the durability of the pick you put into it. Oh, and if you put an Arcane Lamp with Lux aspect being fed into it next to the Arcane Bore, it'll also automatically light the tunnel it's making, so no mobs spawns. It completely ignores liquids.
Still think TC is useless for automation? TC has LOADS of things that are useful for automation. And if you go TC, you can have a much more basic power grid, because you won't be needing to distribute power to Harvesters, Planters, etc... So in the process, you spend less materials building up your power grid, while still gaining all of the benefits of automation.