This is among the least important reasons to vote on the POTUS. Most SCOTUS cases are actually far more narrow in scope and impact than the ones you described. Aside from that, in this particular election there is no good reason to favor either major party candidate with respect to SCOTUS, if one's agenda is a progressive one. So the motivation to GOTV for them based on SCOTUS is isn't necessarily there.
Trump provided a list of conservative legal figures he might nominate - whether or not Clinton's choices would be ideal, progressives should find them better than Trump's.
To give a concrete example, the current deadlock has stopped Obama's deferred action immigration program, affecting the status of millions of immigrants. It seems likely a Clinton appointee would flip that result, while a Trump appointee would not.
On the other hand Hillary seems to be keen on augmenting the government's spying activities, criminal enforcement, and foreign aggression. There is no good reason to think that Clinton's nominees will in aggregate be better.
