LW is a VERY good tank bonus, but it has maximum effect for bear druids. Even for warriors, it still provides 63 extra stamina (wrist patch gives 103 stamina instead of standard 40 stam enchant), or you can choose 70 resist to a particular school of magic (no other profession can do this). Leg armor patches are stupidly cheap, which cuts down on upgrade costs.
For tanking, I prefer taking smithing over JC. Sure, JC gives bigger bonuses, but frequently, you need minor tweaks when you upgrade tanking gear, and the two extra gem sockets on hands and wrists are great for that. And yes, levelling mining and smithing together is logical, not only so you don't go broke levelling your smithing, but also you get the stamina bonus along the way. You could go JC and smithing at the end, but your gear upgrades are going to be horrendously expensive, since you have no source of incoming materials aside from grinding dailies, which is mind-numbingly boring. You can do a few dailies and farm ores along the way.
If you wish to maximize stamina bonuses, which is really the generally accepted goal for tanks, it's in JC and LW, they are the only ones that offer 63 stamina bonus (Smithing, Enchanting, Mining, etc. all give 60 stamina only). However, it is an odd combo indeed, and for a measly 6 stamina.
Personally, I look at not only what bonuses it offers, but the cost of maintaining it, as I personally dislike dealing with the AH.