Does anyone double clutch every gear all the time? Even with the syncros, is it still better to double clutch?

 

Don't worry about this so much. Nvegas gets a bit melodramatic sometimes.
Bogging the engine is when you are trying to make it propel the car at a point in the rpm band where the torque is inadequate to do the job easily.
Moving the car along at a steady state at 70 mph (or even at 50 mph) in 6th gear will not bog the engine in any way UNLESS you attempt to accelerate with heavy throttle or go up a steep incline. In these cases, you are asking the engine to come up with more power and torque than what it can produce at that rpm to do a job that requires that extra output. There is plenty of power and torque to cruise at that rpm at that speed in 6th. If you find yourself going up a steep incline or in need of accelerating briskly, THEN, downshift so you don't risk bogging. Each driving scenario has its own characteristics and requirements. Your job as the driver is to understand what's needed to perform which task.

For example, I could easily run at 1000 rpm in 6th gear at 20 mph without doing any harm to the engine if I'm just coasting down an incline and not trying to accelerate beyond what gravity would take me. The engine isn't putting out that much in this scenario but, it doesn't take much power and torque to do this.

 

NO, double clutching is not required in a modern day manual transmission. The syncros do the job adequately and is built for that purpose.
Double clutching is only necessary to defeat the 1st gear blocker ring like when you are trying to engage 1st from too high a road speed. In this case, you also better be rev matching or you'll be in for a really big surprise.

 

So would the only necessary time to double clutch is my previous scenario (2nd redlined to 3rd) to slow down the countershaft down enough to safely put it into the sequential gear? Or are there other necessary times to double clutch? I haven't taken a tranny apart so I'm trying to educate myself. Thanks again for all the help.

 

Not really. 2nd to 3rd is not a severe enough transition to warrant a double clutch. 3rd can take it. It's the 2nd to 6th that is the worst differential in the speed of various spinning parts.
Double clutching is predominantly for a high speed downshift into 1st. Since it's not wise to skip shift, I don't like to dwell too much on the "proper way" to do it. It's best to just not do it at all.

 

I know it's not required--but once I got in the habit of double clutching with my last car, I can't stop. It just feels better when I'm downshifting. Sliding into a lower gear is like butter; no resistance whatsoever.

Plus it impresses the ladies.

 

Gotcha

 

heel toe is to

 

 

I've never known anyone who skipped gears on upshifts after owning a manual more than a month. Once you get accustom to the car, it should only take you a couple of seconds to go 2-3-4-5-6, engaging all the gears. It's not worth the strain of going 2-6. I'm not even sure how you're doing that smoothly unless you're redlining then backing WAY off the gas.

At 60mph, you're going to have next to no acceleration in 6th. If you decide
(for some reason) to redline 2nd and then hold that speed without a bunch of shifts, you'd be better to go 2-N-6 and actually line everything up.