I like automation lanes. They're good.
Unfortunately I can't say the same about track lanes because:
1. Bouncing clips on a lane puts new clip to the topmost lane. No good.
2. I can't find "Remove empty lanes" feature anywhere.
3. Drag clip from lane to new track does not work.
4. Track Lanes on/off button location is - to be polite - not well thought.
5. They take too much space and make Track View look confusing (or I just can't use this feature yet)
6. Empty lanes with Solo button on look confusing.
7. Add/Remove track lane buttons are too small.
8. Vertical track view zoom may throw active track/lane out of the screen. After zooming I need to search track manually.
9. Copying audio clip on a lane may mute new [linked] clip gain to -INF even if clip gain envelope is in the defaul 0 dB value. ("Submitted to development" few days ago.)
Summary: I do not enjoy Track Lanes. Either I don't know how to use them properly or their design does not suit my workflow. Now I avoid using track lanes and use tracks instead.