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Yeah the tracking is enabled regardless following a successful alignment. You can manually slew wherever you want and it continues to track, as it knows where (it thinks) it is tracks in Alt/Az appropriately.
One thing to watch out for though...if you've, say, GOTO M42 and then manually slew to M46, and then accidentally hit the Enter button, it will then go back to M42, as that will still be selected on-screen. You can avoid this though by hitting the back button so it just says "Nexstar SE" on the display.
While they're an old-ish style mount without encoders and all the modern jazz, they're pretty versatile and the built-in database is quite extensive (at least, in the 6/8SE...not sure about the 4/5SE). The SE also features the "Precise GOTO" so if you're after something faint, you can go to a star near the target, it will ask you to Sync, and then the goto will be more precise. In theory.
I find the goto performance to be very much related to (a) have the mount nicely levelled and (b) spend a couple of minutes to get the alignment stars bang in the centre of the eyepiece at a reasonable magnification - I'd suggest using a reticle eyepiece to reduce element of doubt.
While I have a bigger (and thus, heavier!) mount for my scopes, the SE mount is just so easy to setup and get going with the C8 that I still use it a lot.
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