I never liked her... She sits in my bedroom and stares at me sleeping.
Uthgarde the Unbroken has proven herself to me on an epic bear hunt in the Pale and is my main follower.
I also like Golidor (or whatever his name is) who hangs out at his family tomb.
I tend to use a few different followers, use whoever is close for a while then send them home when the mission is complete (whatever that may be).
I would never reload after a followers death either, dead is dead for them... they become another part of my legend.

But Lydia?
No... the only time she'll die is with my hammer splintering her skull... Maybe not today, maybe not tomorrow... but someday, someday.