I love the Timewalking stuff. I didn't start boxing until WOTLK before quitting WOW at the beginning of CATA and restarting 5 months before MoP ended. So I basically only had boxed WOTLK at level. Brings back memories doing the WOTLK timewalking and seeing what it would have been like to box other expansions.

After gearing up 8 toons solo to around IL 700 and now pushing 680+ on my new team that I've only leveled up a couple of weeks ago. I've picked up a few tricks for rapid gearing. I don't raid hardcore because I have too many characters. But you don't have to raid to get to high IL.

When you first ding 100 do the shipyard quest for sure to get to Tanaan. Baleful gear drops like candy from rares, which are plentiful, and also chests. You will get baleful items very rapidly from chests. You can literally bare minimum get a full set of 650-675 gear in a day. Doing a few bonus areas doesn't hurt to fill gear gaps with apexis crystals. Having flying unlocked will make everything vastly faster.

Every day go kill the 3 rares @ Highmaul in Nagrand. You will probably get 1 empowered apexis (worth 20k apexis) that will upgrade your gear to 695.

Kill Kazzak every week for a chance at free 705+ gear. I've went straight from heirloom capes/crap wrists to 705 replacements in 1 kill.

Lastly Timewalking is an easy way to instantly gear your guys. But you'll be replacing it with baleful which is infinitely easier to get- so it's up to you. Luckily the gear isn't that expensive and you can get a whole set from that 500 coin reward for doing your first Timewalking dungeon.

P.S.
Crafted gear is dirt cheap now.