What's The Point Of Inserting Meter/KeyChanges?

I thought I would bring this up to find out what people are using the "Insert Meter/Key Change" option for.
Is it just for following along with the meter/key view?  Does it add any functionality?
 
Thank you!

Sh03e
Think about composing a classical piece where you need to change and visualize, the change of dynamics (tempo/metric and key) across the entire composition or just in fractions, in fact i used that function to set different tempos and key change to a electronic/progressive track for a violinist with i'm working on.

i get changing the tempo, but still not the key.  What's it doing for you inside of Sonar?   Is it just for the Staff View? 
Thank you.

I change meter all the time.  If i need a downbeat to land on a picture cue while scoring to video I might add a 5/16 measure to get it to happen.  I have it Keybound as I use it 2 or 3 times an hour on a normal day.
 
Key change is something I use less,  but if I'm going to work with live musicians later (staff view)it becomes a very valuable.  
 

+1 to both meter and key change comments above.
 
I have single projects with more than 20 meter changes, and I use them and key changes for notation purposes for scoring midi, and I also use meter changes because Sonar is being set to line up on measure/beat boundaries, not on absolute time-based boundaries.
 
So, things for me need to properly line up to beats within measures, and measures in the project.
 
Bob Bone
 

I don't quite understand the question, to be honest.
You use the Key Change when the key of the music changes and Meter Change when the meter changes.
Those have always been some of the fundamental things in composing.
They are not gimmicks but normal tools for a composer, daily tools for one who does
other than rock/pop. Notation can get really fiddly if you don't know how to use those (I don't :o)
People use these features just like you use a screwdriver to attach a screw.

I think the answer to your question is that yes, inserting them is for more than just the staff view. It allows SONAR to use it's quantization, groove, audiosnap, and pitch-shifting tools when executing editing functions so you can continue to write/score using them. Otherwise you'd just be left to your ears to manually position things....ugh to that!
:-)
 

Key change also changes how sonar displays note names in Event List, so if you are working in G major it can be disconcerting to see C flats instead of B. 

As I write this, I am working on a song that is in 4/4; however, I chose to cut one measure in half before each chorus to make it move more urgently.  I inserted a meter of 2/4 for that measure and then went back to 4/4 for the next measure.  If I had not done this, all the verses and choruses after that point would have started in the middle of measures which would be confusing.
 
I also use key changes so the staff view does not look like a mess, and so Sonar will help me by inserting notes that are in the scale as the default.
 
Naturally, if you are doing a waltz (3/4) and just accept Sonar's 4/4 default, every bar (measure) will be off.  It is a lot easier to think of a chorus as starting at bar 20, for example, than at bar 13.5 or whatever.