I do use Jamba Strobe. I advise new users not to use it during combat because more often than not it complicates things, especially when someone doesn't have any experience with it. I personally use it for mounted travel and in certain fights that are movement heavy or easier when kiting {Jousting in TotC, Ick and Krick}.

Addons are a pretty subjective thing. People can't live without DPS meters, I can't stand them. I can't live without Pitbull, other people would sooner die than use it. You find the non-wow noises of those addons distracting, other people consider them a godsend so they can move their slaves or react to procs without having to guess which toon or track down the right visual clue.

People can even find the same mod a little of both. Taking Jamba as an example - I use a lot of Jamba, then there's parts I just don't have any use for. I like the Jamba Quest Log, but don't use Jamba Quest Tracker, preferring the customization of tomQuest2 instead. Or smaller mods like MSBT. Some people love to see a stream of numbers and crits and who's proccing what in their scrolling combat text, I find that excessively busy. I have my MSBT configured to be more for alerts like when my shields are dropping and quest status notifications.