I agree completely and this is something that I've noticed I've been doing often as well. I get caught up in RL, Check my tags quick at work, get home, and then forget that I already checked certain ones and it happens ALL the time.
I've been horrible about it lately, and then just plan busy. I know I owe even most own cast several tags atm.
I'll try my best to remain active in tagging back to people. And if I do drop a tag or forget to notice, please don't ever feel shy about poking me about it! I like when people remind me (and if I'm slow I'm fine with multiple reminders. I might even tell you to re-remind me if I'm too busy at the time_ because between my characters elsewhere I really do just sometimes forget or it gets lost in between everything.
I'll work better for this! I'm glad you brought it up and I hope that I can improve.