Hi Yahoohoo and welcome to Mac ownership and MR
I have your same computer (2010 MBP 13" 2.4gz, built in November 2010) and I'm really enjoying it (but I've had many older Macs and was most recently using my ancient, creaky iBook after a premature Macbook death, so this seemed like a HUGE upgrade).
I don't know if I *needed* to do this, but because of my Firefox tab-hogging ways, I just ordered an 8gb RAM uprgrade for my MBP. It's just so darned affordable now (I remember when it used to be a big-hairy-expensive upgrade

). (Even a respected name brand 8gb kit was under $100 and easy to install oneself.) At least from my understanding, lotsa tabs open = lotsa RAM useful (if I'm wrong, anyone feel free to correct me!) (Of course maybe you are not a tab hog anyway).
I envy you your Linux skills -- I bet you'll just be playing around in Terminal whereas I have to steel my nerves to do so
Mostly just posting to say "welcome" (but I read the thread because I have been learning more about reading the activity monitor).
Miss Terri