Has anyone here switched to ITB after being out.

Bouncing offline is also an ITB resource issue. I tend to add plugins until I run out of CPU, even with large buffers. It was similar in the hardware era, we'd mix with every piece of outboard we could scrounge hooked up at studios like the NY Record Plant. We wouldn't print the 2trk until we ran out of gear.

But offline bounces let the computer do the math without farting, and you can use the oversampling options offline where they'd choke the box realtime. 

Of course you have to check the mix. Especially to play on systems with hyped lows and highs.