You can still level as Dps and just save up all your artifact power upgrades you get for holy. You can already get your second and third artifact at lvl 102. There is only 1 quest so far that gives you artifact power automatically (and u could just change spec as far as i remember), everything else is from items. So maybe you should have done some research before you assumed
Holy also has a stun, wich can also be used to silence and if you choose the talent you can make it into a stun that doesnt break or choose the knockback wich also slows. Disc has fear + knockback talent. Its really not that bad. And i myself almost never need it cause i can easily keep myself alive having 3 mobs on me without ccing.
Blizzard made healer leveling more friendy, but in no way are you forced to level as healer.