Deadlifts are still a great exercise, but there is a key difference in using them for size and using them for health. For health/fitness results, you should lift just as heavy as you ca reliably do sets of 6 and you aren't in pain after 3 of them. Add reps as you progress and when you get to 3 sets of 8, add a little bit of weight and drop back down to sets of 6. Like 5-10lb in plates, then try and work it back up to 8. The injuries tend to come from the guys who are doing 5x or pushing their max up, which is great if you are bodybuilding or powerlifting, less so for keeping yourself injury free.
You only -have- to go heavy if your goal is to load on muscle relatively quickly. Otherwise, it is better to stay within safe limits and slowly increment your weight up over time. And capping out at a certain weight where you don't have the grip strength to maintain a grip or you feel like it is heavy enough to hurt you, just stop, drop the weight a little bit and keep adding reps over time. Substantially safer method and you still get the benefits of a solid compound exercise.